I would just say mash the banannas like you would for a tottler, if you can handle strawberries you can handle banannas. I would suggest exercise, in particular see about
get a pedometer so you can do 10,000 steps a day. (I use that and a polar heart rate moniter that counts cals burned for me) But the basic ideas is that you have less calories going in then you do going out. I do suggest you explore why you are not your normal weight (it is the remission? or are you having the structural problems that hinder you from exercising). There is no magic formula, just create more calories going out, then going in. Do the research and the trial and error that it takes to find a formula for you. I am not saying this is easy, and I am certainly not doing it now because of the hospital thing, but I can suggest some goals for you.
60 mins of cardio a day (work up to this start with like 5-10 mins)
It would be good to work in weight lifting as well if you can
3 times a day- drink 225 ml (1 cup) of skim milk
4 to 5 fruit servings-Try fruit juice and blended whole fruits so they are no bigger then a pencil eraser (you could throw some yogert in here to make a smoothie.
4-5 veggie servings-same thing for fruit and possibly a food processor would help getting the food down to a size that is doable.
fish oil or flax seed oil for omega threes
a card deck of protein (meat, chicken, turkey, other very lean proteirns a day
I sure other people can think of goals for you, but please do not feel like you have to do all of this at once, but if you can do one change/improvement a week that is doable and hopeful you will keep feeling better and better.
We will find a way, or make one.-Hannibal (crossing the Alps in the 15th Century on war elephants)
Make sure your suffering has meaning...