Fluconazole is prescription-only in the states, OTC in Eastern Europe, and who-knows-but-definitely-available in places like Mexico. Try an online pharmacy.
Btw, if you're going to do a long-term treatment (the one-pill magic bullet will make it come back within a couple weeks and build resistance, but not cure anything), consider itraconazole (sporanox) instead of fluconazole (diflucan). It's milder on your system and seems to actually be somewhat more effective.
Also, if it is yeast, then the Antibiotics WILL undo any good the azole does, and make you worse off than before.