Katie
Are you sure you have ordinary bacterial cystitis? There is a condition called Interstitial Cystitis which is chronic inflammation of the bladder wall.As it is not caused by bacteria, antibiotics dont do any good.Cranberry juice is the last thing you should drink if you have this condition as it is too acid.Ask your doctor/urologist if you may have this condition. There are many excellent websites giving support and information, search for sites under "Interstitial Cystitis" Good Luck.