If you have a serious medical condition which you do not wish to give any details, then go to Bangkok-Pattaya Hospital and see doctor there.
For a general practitioner at a reasonable cost, you could try the Banglamung Clinic on Pattaya Tai Rd/South Pattaya Road at intersection with Third Road. The clinic is on opposite side of the road from Friendship Market almost at Third Road.
There are two clinics there, one is a private clinic and the other one is associated with Banglamung Hospital. I have used this clinic for routine medical conditions and was satisfied.Cuts, minor infections, vaccines, etc.