I just did doxycycline for 10 days (epiditimytis). got better, but regressed a little. how much longer before i worry about another antibiotic? my

Need another Abx: If your symptoms did not almost completely resolve by the end of the abx course then you probably needed a longer course or a different abx. Recheck with your doctor.

Your DR will assess : If u need another course of antibiotics. Sometimes drs give longer duration of meds , 2-4 weeks, if we think that the infection hasn't cleared up completely. Take care!