Where can I get doctor's prescription for medicines for abroad travel?

I want to go for a foreign trip. I want to carry general medicines such as fever, acidity, allergy, antibiotic etc. with me. However, I am unable to find a doctor who will prescribe my list of medicines. I reached out to few doctors and they only want to prescribe me one or two medicines. They keep asking me what my ailment is. I don't have any! I just want to carry medicines with me for emergencies ! I cannot take medicines with me if it is not on a doctor's letter. Can anyone give recommendations on a doctor who provides prescribed for abroad travel?