According to the history as mentioned in your post, your symptoms can be attributed to:
1. Sleepiness is due to intake of antihistamines, which have a sedative property.
2. Stomach pain is due to intake of the mix of Ibruprofen & paracetamol
, as they are notorious for causing Gastritis by increasing acid formation in stomach.
1. Proton pump
inhibitors like Omeprazole
,etc. (which prevent acid formation in stomach
2. Dietary modification- avoid consuming irritating substances such as acidic & rich foods, caffeine, nicotine, and alcohol.
If symptoms still persist, it will be better to consult a Gastroenterologist
Wish you a good health & speedy recovery.
Thanks & Take care.