I have been taking Doxycycline for 8 days now and still have burning when I urinate. I have been on 100 mg twice a day. I have not had any sex while on this medicine. I have several Z-Pac's (NEW) How many 250 mg pills should I take that will cure this. I know that I dont have a urinary tract infection. Please help me! I will not go to a clinic. Where I live is very remote and the nurses have been know to talk, I have heard them.