Abdominal bloating, Whole body pains.

Hi doctor, From past 1 1/2 year I have been suffering with severe abdominal bloating, constipation, whole body pains & multiple changes in the body. To let you know my weight is constant and I am not loosing or gaining weight. I undergone several tests like endoscopy where it shows multiple erosion's in stomach, ultrasound was normal, liver function test was normal, thyroid also normal, vitamin-d arounr 27.89 ng/mL, vitamin b12 is also normal & all arthritis related tests are negative. I have severe pain in back, neck & in finger joints of both hands & legs. As well as I have dry eyes. I got lot of pimples on face as well. My skin got dry & itching in some areas. Acid reflux as well. This all started after I joined gym. During initial days it was nice & on some day I fainted. I think after this all the problems got started. Till now unable to identify the root cause. Please help me what could be my problem. I also want to live a normal life like others without all this problems