Colon Perforation Surgery and Diaphragm.

Hi, My name is Anshul & in 2013 i met with an accident, a knife stab in lower chest abdomen, it resulted in perforated colon and diaphragm tear of 2*2 cm. It was a major unplanned surgery. I was 28 waist then and now my waist is 36, My stomach is always bloated and constipated. I go through hyper acidity On a frequent basis and have to take OMEZ sodium buffer powder to cure it... I have to go to washroom to fresh'n'up couple of times a day. Also, i have a weird sensation in the operated area, whenever i touch or whenever any body part touches that area.. even when sitting in squat position it troubles a lot... Please help and suggest. I need to know what should i do...? If i need to see a doctor then whom should i visit ? Please advice