Hey S.
I don't think anyone who has children would blast you for feeling the way you do. As much as we love our children the constant noise of them crying when you can't figure out why and the lack of sleep can drive you crazy.
I know at 10mo little ones can start the seperation anxiety thing, so when your not there, like bed time, and when you walk away or out of his sight may be one issue. As you said he has a hard time pooping sometimes, you might add something to his diet that will help with that and chase it with gas drops. The gas drops will help w/ 2 things, one if he can't poop and eats foods or juices to help he may have some gas. And the second thing is if he is crying a lot that pulls a lot of air in their tummy and the constant crying will cause gas. I would also take him to the dr. to make sure he does not have an ear infection. An ear infection seems to affect most kids when they lay down and will interupt sleep through the night. I would also feel in his mouth to see if he is cutting teeth. If he is go for the Motrin. Motrin works better then tylenol for teething, I think. And the only other thing I can think of is make sure he is comfortable as far as his temp. is he over or under dressed. The first time my son had a crying fit he was about 7mo old, I called my mom and asked her to come check him out because I did not have an idea what it could be. She came over and said first get some of those clothes off him he is to hot. And as soon as I took his little pants off she said now loosen his diaper, it's to tight, his tummy needs some room. As soon as I did, he calmed right down. It's just a thought, I know you have probably tried that plus a tons of other things.
As far as the hungry thing, if he has an ear infection or is teething he may not want to eat and he may be getting hungry in the night. Can you or do you add cerial to his bottle as a little extra filler (even if it's just until he passes this stage)that way even if he does not finish it he may feel fuller longer. Oh, and now that I mentioned bottle, the niple he drinks from may be to slow and that can cause gas and frustration (just another thought).
I'm sorry things are so tough right now. It's funny how this time is supose to be so loving, sweet and fun. And as moms we are suppose to "enjoy" the time and bond with our babies and yet some days it's really hard to "enjoy' this time.
Don't forget, if you have family of friends close by ask for help. That is really the best thing you can do for both of you.
Well I hope things get better soon for you and if you can't get help and the crying goes and goes and you feel yourself getting more and more frustrated you can put him in a safe place like his crib and go take a breather for min. away from the noise. I know that does not help w/ the lack of sleep thing but it can help in a pinch with the frustration level.
Have you ever, while he is in the middle of all the crying walked outside with him? That has worked for me before. Something about the fresh air calms them, maybe its the change of things to look at, who knows. Just another thought.
Good luck and let us know how and when it all settles down and what did the trick.
Stay well and hang in there.
T.