Upper back and middle back. It gas only?

I am experiencing some sort of tightness or uneasy feeling in the upper and middle back. I am having enzyplex syrup for indigestion as i was diagnosed with dyspepsia, infection of gut, regurgitation of food, gastritis. It is better than before but sometimes or when i concentrate on back i feel like i am having tightness and uneasiness in the back. There is no pain except when sometimes i feel like as if someone is pushing and releasing repeatedly from within towards outside but very mildly. If i have a walk or burping it reduces to some extent so i feel as it is trapped gas. I also have stools with gas and pressure in morning for which i was prescribed enzyplex for indigestion. I am worried because i am feeling tightness since about a week that comes and goes as i mentioned. So is it gas only? No history of injuries. But noticing bubble in urine sometimes mainly when conc. and especially when done in a commode directly in water. Height 5.5 and weight approx 70.