Gall bladder removed need need advice how to make mpg work now

Hi had emergency gall bladder surgery 5/3/15 stayed in hospital 3 days. Not really given any food plan on discharge. Been on my fitness pal for 255 days lost 55 pounds gained back 5 since surgery usually workout everyday and drink 120oz water. Can't work out. Stomach hurts . Anybody got advise how to stick with mpg and stop the weigh gain. I only have 27 pounds to my goal. Thank you in advance for you comments a d time