Talk to Gastroenterologist on Stomach Problem

Asslam o alikum Sir and Mam My name is Muhammad Younis any my age is 21 year My issue is that one year before i was patient of (pilya) mean kali kaman but after that i was use medicine and gulocose drips and my test was clear but from that i feal weakness and stomach problem and my weight is around 50kg so i have request you to help me for clear my this issue and tell me tips to solve the stomach problem and easily increase my weight.