Weight Loss. Is it normal?

Since last 2 months i was suffering from Stomach issues, cramp, abdominal pain, abnormal motions, mild fever (upto 99.6), red eyes, headache. Consulted 2 Gastro during this one said its infection and given twice infection course zifi, satrogyl and then Nizonide 3 days. After that he has said to do lots of tests like colonoscopy endoscopy biopsy ct scan and blood tests. Than i have taken opinion of one more senior gastro of Noida he said no need for tests its IBS. But after taking 10 days course again i had same issues then this new gastro also said again you exposed to infection. But from last 20 days my stomach is better motions are better and i am able to eat. Taking menoctyl, enzar forte and vizylac. My concern is that during all this i had lost 8 9 kg of weight, since from 15 20 days my stomach is better and i am eating enough but weight is not increasing. Is it normal? Should i continue with the same gastro as i am having relief as well.