First, as far a sleeping through the night goes, the waking at night is only a problem if it is an issue for mom. Sleeping through the night is a developmental milestone like any other. Even if you did nothing, your child won't be 12 and needing to nurse throughout the night to get to sleep because you didn't teach him to sleep on his own. So don't let anyone make you feel bad because your child still wakes at night. I know plenty of adults that wake at night to pee, get a drink of water, adjust the blankets, etc. It's normal.
My daughter just turned 2. And she doesn't always sleep through the night either. She's recently gotten a lot better, but 19-21 months was a rough period as far as sleeping goes. She is also still nursing although we have been weaning for a while now. She did wake at night and need to nurse to sleep during that time though. For us, she had a couple things going on. One was a developmental word explosion (she started talking in 2-3 word sentences) and also her 2 year molars. Is there anything new going on developmentally with him? I would check to see if there is any teething going on and maybe offer teething tablets or a pain reliever before bed to see if that helps. Even though I was ready to quit, it was still important to my daughter to have that comfort at night, so I made a pact with myself to make it through her molars and then proceed with weaning. I don't think it's your imagination that he wants to nurse more as he feels you pulling yourself away from him. And I sympathize with you, because I have definitely gone through periods of feeling really resentful about nursing at night when all I want to do is sleep. I would suggest giving lots of cuddles during the day to reinforce the close bond I'm sure you have and maybe back off with the weaning for a couple weeks because it doesn't sound like he's ready to stop. And I'll tell you what's working for us as far as weaning goes, keeping in mind my daughter was REALLY attached to nursing.
When she was about 22 months, her last molar had broken through, so I was confident about her not needing to nurse because of pain issues. We were still nursing at nap and bedtime and during the night if she woke. So I started by nursing her until she was really sleepy and then telling her she could nurse the other side, but then she had to stop because it was hurting. I wasn't lying, but I just thought her latch had gotten really sloppy lately. (I later realized it hurt because I was pregnant.) You could maybe tell him your boobs need to go to sleep to make more milk or something along those lines. Anyway, she was pretty understanding about having to stop nursing when I asked her to (maybe 5 minutes per side at naptime and I didn't make any changes to bedtime yet). She started rolling over and going to sleep without a boob in her mouth. This laid the groundwork for transitioning to no nursing at naptime. She was used to nursing to unwind and go to sleep. My next step was to start decreasing the amount of time she could nurse and replace it with another activity. I originally told her I was going to count to 20 on each side and then she'd have to stop nursing so we could read a book. That caused a lot of anxiety in her around sleep times as she'd worriedly say, "Mommy no count!" when it was time to go to bed. So instead I started counting in my head. Every week, I would decrease the length of time I let her nurse at naptime. 20 seconds the first week, 15 seconds the next, then 10, then 5. After we were down to 5 seconds each side, I told her we weren't going to nurse at naptime anymore, just read, but she could still nurse at bedtime. It went off without a hitch. I should say, she was in a toddler bed by 20 months, so it was easy to lay down with her to nurse and eventually transition to reading. I also offered her a sippy of water if she wanted it. She understood about not being able to nurse anymore, but she would ask for cow or soy milk. I wasn't comfortable with the idea of milk before she sleeps at night after she has brushed her teeth, so I only offered water. Being patient at naptime helped a lot at night for me. On her own, she started requesting I read books at night. She still woke occasionally at night, but didn't always need to nurse back to sleep. I could lay down with her until she fell back asleep, usually after getting her diaper changed. We are at the point now that we nurse a little at night (right now it's 15 seconds) and then we continue on with our bedtime routine (which by the way, has taken a little bit of time to work the kinks out-nurse, sit on the potty, read, lights off, sing a little and go to sleep). If she wakes early in the night (which is kind of rare right now), I lay down, put my arm around her, and she goes back to sleep on her own. If she wakes after 4 am, I bring her to our bed and nurse her back to sleep. As she has learned not to fall asleep nursing, she's gotten better about going back to sleep without it. She even sleeps through a lot of nights now and there was very little crying involved. To get rid of the during the night nursings, if they are still occurring when we make the final move of not nursing to sleep for bedtime, I will tell her she can have milk when the sun comes up. Then I'll offer her a sippy of milk in the morning. I know it took over a month to get to point where we are now, but I feel good about it. I had already nursed her almost 2 years so really, what's another 2-3 months in the grand scheme of things if it means we can wean without either of us feeling traumatized? I couldn't imagine cutting her off cold turkey when she's been used to nursing as a comfort for all of her short life. Not to mention that going cold turkey can lead to plugged ducts, engorgement, or mastitis in mom. Anyway, that's my 2 cents regarding weaning. I would have preferred a break in between nursing and pregnancy before nursing again for another couple years, but I don't regret how we are ending our nursing relationship. I hope you find this helpful. Good luck with however you proceed.