Protruding belly. Give some advice.

Hi docs, I have observed that my belly has protruded a little unusually over the last 2 weeks or so. Earlier I didnt pay much attention, but today I feel that my stomach is a bit tight, at the same time it is protruded (if I completely release it freely, it looks like that of a pregnant women). After moving to a new city I have been eating from restaurants and mostly non veg food. Also, I had previously (since the last 1 month) experienced twitches/spasm in my chest center, just below center. I was advised that I should eat more vegetables etc. I quit outside food and have been eating home made veg food for the last 10 days and the twitching problem has gone. But the belly is still there. I dont understand why is it so. There is no pain or anything else but I can feel my unusual stomach. I am otherwise a fit guy and I used to go to gym , which I quit in mid may. During that time I had no twitching, belly problems at all. Can u experienced people please give some advice. Thanks !!