3 days might be short for the flagyl to work, I'd give it more like a week to see if it was effective.
If your Chlamydia infection is
ting, an excellent choice here would be Clarithromycin (Biaxin is
the brand name). It has higher activity than azithromycin
, and you could take up to 1g per day for 14 days as a dosage. This is
quite a high dose, but in your case it might be just what you need to clear your infection.