I have had symptoms of cystitis and vaginal itching for over 2 months. I did a urine test and vaginal swab. What should I do?

I have been taking Alesse 28 since I was 19 years old I had no problems until three months ago. I started having vaginal itching without infection then symptoms similar to a UTI and pelvic pain without cystitis. I went for a pelvic ultrasound and everything is fine too. I read that these symptoms could be side effects of the birth control pill. I have noticed that my symptoms are less bothersome when I finish my period week and it starts again two-three days after I start taking the pill again.

Perfect thanks for the advice! Because when I saw that no treatment was working and I had no infection (urinary and yeast infection) I went to look at the Alesse pamphlet to see the possible side effects and there was indeed vaginal irritation or infection as well as symptoms suggestive of cystitis.