At any rate, Doxy (if you followed the prescription as instructed) should get rid of Gonorrhea
, Chlamydia, UreaPlasma, Mycoplasma and
Trichomoniasis after 7 days of treatment.
If I understand your situation, you begun taking Doxy about 3 days ago...
Symptoms usually dissipate after 3 or 4 days (maybe longer).
If this is an STD, then the symptoms could have shown up due to the drug itself and would probably dissipate as well.