Chrons or uc or IBS. Pains started.

Hi Doctor, Last year I was diagnosed with covid and doctor had given overdose of tablets. After covid recovery I was suffered from gas, constipation and mucus in the stool. Doctor had prescribed colospa and Vsl 3. Diarrhea had controlled. However, after few months I was suffered from constipation. I went to the doctor and doctor had performed colonoscopy. However the results were normal and doctor mentioned that no ulcers found and asked me to go back. From last few months I am facing alternative diarrhea, gas and constipation and back pain.when I eat spicy food, nonveg  and sweets immediately I am passing stools From last few days muscle pains started. I feel like weight loss and checked my weight( no weight loss found) and totally upset with my symptoms sir.. And worried about my health Please advise. Thanks,