You are NOT crazy, but you will go crazy if you don't change something.
Every mom on here has been where you are. For my first one there was a time when I was on maternity leave that I went 3 days without showering or changing clothes. Hubby finally walked in and marched me to shower.
When I had my 2nd one I swore it would be different, and for the most part it was. Here are the rules that I gave myself.
1. Take a shower every morning. Whether it is at 2am, 6am, or 8am.
2. Get dressed in fresh clothes every morning. Before you pick up baby. Once you are dressed you can take on the world, greet visitors, and leave the house!
3. Sometimes you HAVE to let baby cry. If you HAVE to pee, and baby is crying what happens if you pick up baby BEFORE you go to pee? You still have to pee, but now you have to hold baby while you go.
4. Use an umbrella stroller in your house. When baby wants to go with you but you can't hold baby at the moment, strap her in and take her with you. She can then sit up, see the world, and YOU get 2 free hands.
I also had a playpen in the kitchen, the living room, and my bedroom for the same purpose. I found them on a super sale. Hubby thought I was crazy until he saw how it worked.
Like Riley said. Put baby in a safe place, then take 20m for you.
Hugs
M.