Stomach Issue. Unstable headache.

Since long my stomach not well, in march cramp frequent motions semi digested motions. Then consulted Gastro he said swelling in stomach, LFT abnormal after 15 days course it becomes normal. However in between stomach was not fully normal. Main issue started in June cramp, pain, frequent motions, nausea, mucus, mild fever, dr said infection done infection course 3 times. Lost 8 kg weight also in 2 3 months. Earlier Gastro said to do biopsy, colonoscopy, endoscopy, etc tests but i havent done any of them. Current Dr saying no need for tests, it is IBS and i am consulting him since 2 months around, some relief is there but loosing weight even while consulting him lost 3 kg weight, in between some time i am having cramps, mucus in motions, some time i am having constipation type issue as well, some time going 2 3 times motions but still heaviness, always feel heaviness and urge for motions. Since 3 4 days again non solid motions little cramp. I also feel weakness unstable headache.