Hello. I Have Off And On Pain In My Lower

Hello. I have off and on pain in my lower back, right side. It is sometimes mild, sometimes more painful. It is like a stabbing pain and then a dull ache, but then it goes away. Also there is a kind of twitching that comes in waves through my lower pelvis. The pain has started to show up on the left lower side too. My upper abdomen kind of pulsates. It feels like food gets stuck right before going in to my stomach. Almost everything I eat gives me heartburn, from bananas to toast. I almost can't drink alcohol anymore because it hurts so badly and stomach cramps wake me up at night. I often have pain that radiates from stomach to in between my shoulder blades. I'm a 30 year-old woman, 125 lbs, 5'3". I've been to multiple doctors and had ultrasounds. Can anyone help me? I'm tired of wondering what's wrong with me. Btw I'm not pregnant! Thanks.