Thanks for writing your query.
After reading your post, it seems that you are having upper respiratory tract
infection with an increase in acidity in the stomach.
You should take an antihistamine like cetrizine 10 mg once a day along with a decongestant like phenylephrine
for relief from stuffy nose and post nasal drip
can be relieved by taking an antacid like Omeprazole 40 mg along with Domperidone
10 mg once daily before breakfast.
You should also avoid spicy/oily foods and avoid remaining empty stomach for long durations.
Also avoid excess of tea/coffee.
Drink lot of pure water daily.
If the problem persists, get yourself clinically examined and investigated.
I hope this is helpful to you.