Digestion/Stomach Issue. Treatment.

I have tested +ve for Covid 19(ct value 14) but asymptomatic. I have no cold, fever, sore throat, loss of sense of smell or taste. I have taken some medicine as per physian prescription(Prescription attached) . I am feeling normal like before since tested 10 days ago. But since last 3-4 weeks I am feeling like I have some digestive/stomach issue. After 2-3 hours of having meal (heavy Breakfast or lunch/ dinner, Non veg or spicy meal) or after smoking I need to go toilet (for stool). Feels slight tightness in stomach or Sometimes stomach growling but there is no abdominal pain or any kind of pain. No diarrhea or neaussa. Is this due to gastronomical issue or due to covid. Kindly suggest for further treatment. Thank you.