Hun you've been having a rough time throughout pregnancy and since bub was born. That you've last regularly seen a therapist in late pregnancy is concerning. I don't think you can see someone so infrequently when you are suffering so much and then claim it's not helping.
I don't mean to offend - that's not my intention. I've seen you struggle for a while now. I think it's time to Stop saying why and start saying why not. Take some appointments during work time, take some appointments at 5pm and get your hubby to finish work early and look after your DS. Or hire a sitter.
You will continue to struggle with parenting and life in general unless you bite the bullet, go with the flow, listen to your doctors and make sacrifices to get yourself better. You deserve to be happy xx