Stomach pain without any physical condit

I Have stomach pain in left side near to belly button since 1 year. It started with acidity issues and from random time to always. Now I have this pain (cramping) always sometimes with burps. Tests done so far 3 time sonography 1 time endoscopy 1 time colonscopy 1 time stool test 1 time CT scan 10-13 different blood tests (LFT, Lead, any many other) All reports came clean and are within respective number limits. After looking this reports all super specialist doctors says nothing unsual. They also mentioned that I am healthy and I shud not be feeling this pain. Dr. Who did endcoscopy told, To walI may have to visit Psychiatrist. I visited Psychiatry as well and he prescribed Axienty related meditions. But I still have pain. I also tried homeopathy and ayurvedic medicines for months. Due to this pain I am not living normal life, except during sleep time I always have pain hence not able to enjoy Work, Eating, Outing, Anything.  Can you help?