starts with tooth discomfort , then front toothache, sinus plugs , sinus pain throbbing pain, swelling upper lip and top gum and upper mouth, then two or three days, gets better, four days much better, still some swelling in upper mouth and top gums, sensitive teeth , but feeling ok,,,,question, is it sinutitus or infection, have taken penicillin before for toothpain and it seemed to work, what is the easy way for prescription