Hi!
If you were my patient, I would treat for yeast. I would probably treat you for at least a week with something oral such as Diflucan, and something topical such as clobetasole.
The problem you most likely have, is that all of those antibiotics have destroyed your "good bacteria" population. Normally there are supposed to be lots of lactobacillus in the vagina. You can get these by taking probiotics and/or yogurt with live cultures.
The good bacteria prevent the overgrowth of yeast and other not so nice bacteria such as Gardnarella. These types of fungus/bacteria cause irritation such as you are mentioning.
One thing to try right away for relief is Crisco--it is cheap, easy and it works. Just apply to any irritated areas. You can also use it as a lubricant.
Stay away from any over the counter products with any chemicals in them and DO NOT take any more antibiotics unless a urine culture (not a urinanalysis) is done and the specific organism is identified.
It will probably take awhile to clear up since it has been so long developing.
Also, if you are taking oral contraceptives, you might want to use a different method for a few months.
Finally, be sure to empty your bladder immediately after intercourse every time. Drink tons of water and cranberry juice/tablets really work!
Good luck!
Dr B