Has your doctor recommened that you change your shower soap,
washing machine soap...etc...??
I tried that first...before all the annoying tests....
I changed to Tide Free....Bounce Free...and Ivory soap...
got rid of anything with perfumes(body washes are the worst),
anything with chemicals that can irritate the area below...
Then RE-Washed all my underwear...etc...
It has worked so far....haven't had an infection since last Nov!
It may not be as easy as that for you...but its worth a try...
I know how terrible it can get!
Good Luck
C