Hiya PrincessHannah and Welcome to HealingWell!!
I'm not sure I can be of any big help to you in this forum. I have read where if there is an existing problem and you eat foods that perhaps you have an intolerance to, or an allergy to that could be a possible cause for cystitis.
I know you've mentioned speaking to your Dr., but I think I'd persue this avenue and speak to him again! There are many reasons for young women to get cystitis.
Best Wishes to you and Hope you feel better soon!
"Because he is he and I am I."......E. V. Lucas
"I Hope You Dance".............LeeAnn Womack
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