Bloating causing sharp body pains. Gas.

I have been suffering from gut related issues like constipation,bloating,acid reflux for more than 8 years and has visited many doctors and no one provided a concrete solution. I even has developed rhinitis and sinusitis also. But recently a gastroenterologist has prescribed me laxatives and some anti depressants and they provided me some relief. Of all the meds nortriptyline provided me much relief. But the thing is it's causing constipation. I have constipation but felt much better than before. After bowel movement i still has some pain and my stomach feels bloated especially on the left side of the lower abdomen. I feel like gas has trapped there on left lower quadrant. After some time of bloating i will have back pain on left side...later I feel pain from left side lower abdomen upto the groin and sharp pain on outer thigh. After that I will feel like nerve pain on the left side of body from shoulder to leg to foot. Whole left side is under pain and feel relief I passed some gas.