Hi there...You are under a lot of stress and my heart goes out to you, my one and only son had medical issues as well growing up which entailed a lot of ICU stays in many hospitals, some close to home and some far away from home, so I can relate just a little because your load is much larger.
This is just a thought because I am totally not in your shoes honey but you know when we get on airplanes and they go over the drill and tell us if an emergency happens, even if we have kids we are to put on our oxygen mask first before securing it on our kids because if we cannot take care of ourselves first then we are no good to our children...so try your best to take a little time for yourself and regroup, prepare some healthy snacks and make food that you can get to quick and not make the worst choices, you went through a lot to have surgery and you deserve to be healthy and feel good too. Make a meatloaf, bake some chicken, (food that you can get to quick and heat in the microwave) buy protein bars, pre-made protein shakes etc. that you can just throw in your purse when on the go taking your daughter to the hospital...I know it's hard but take care of you so you can give the best care to your children.
Our children mean the world to us and we would rather endure their pain if we could switch places, but mommy please take care of you first (it may sound selfish, but it's really not) so that you can have the strength to care for your babies.
I think you did the right thing my reaching out on the site because we get you and understand...if you mess up and eat something bad it's ok, we are all imperfect humans and you are aware of it so you are to be commended considering what you are going through. You will get a lot of good advice here
Take care of you and your kids and we are here for you ((Hugs))