I want to give you a little bit of my input. I have a bunch of medical problems (NOTHING as serious as yours, but still there). I'm not as brave as you, so I'm not going to talk about it here, BUT I will say that when I am "hurting" Bailey can sense it and he really acts out. He is almost uncontrollable for me! Bailey has major separation anxiety and he's a very high maintenance dog (above and beyond being a yorkie). I've gone through 4 trainers and 2 petsmart classes. I can tell you that I think it may have something to do with your baby being able to to sense your medical condition and perhaps is acting out because of it. Maybe you may want train your baby through like a therapy dog program or service dog or something similar? In fact, I don't know why I never thoguht of that for Bailey...LOL! Just a thought...
Good luck with your everything you are going through!!!!!! Hugs!