Stomach Issues since year. Should i do?

In June 2018 I had loose motions and taken treatment for loose motions 3 times. After that problem was resolved. Since April 2019 I had cramp frequent motions since then my stomach is not well in june 2019 I had stomach infection cramp frequent motions since June to July I lost around 8 9 kg weight as well after that I am having cramp, semi solid semi digested stools, nausea, bloating my weight is around 68 69kg which was earlier 76 kg. Each and every month I am having stomach issues like cramp frequent motions and all Dr says its infection and giving treatment for infection after taking infection treatment everytime my motions become normal for sometime after that again these issues come. Dr haven't any logic for why frequent infections. Last month I had shivering bloating Dr said again infection. Since yesterday I am having cramps sometime, semi digested semi solid motions, 2 3 times a day,nausea, bloating since 4 5 days lazziness, extreme weakness. What should I do ?