Burning bladder? Not cystitis?

I don’t wanna go to the doctors right now because of the current situation and I don’t want to take a vulnerable person place. But I was wondering if anyone knew anything to help. I’ve been suffer for a couple of months with a painful bladder. I had a UTI at the end of last year and didn’t treat it until late. After that. I had cystitis and cleared i with those cranberry sachets you get in supermarkets. However now, I find that when I don’t drink a lot of water, or even some days when I do drink a lot of water, of a night time my bladder is really painful and I feel the need to pee. I’ve been taking the cystitis sachets but it’s done nothing which leads me to believe it’s not cystitis.

Also side note. I was researching and saw Interstitial cystitis and a symptom was a painful back. Ever since the beginning of mark I’ve had a super painful tailbone, to the point where it’s painful to sit and I didn’t know if that had anything to do with it.

Any help or information is helpful at a time like this where you can’t go to doctors.

Thank you!