Stuck in UTI hell.. HELP!!!!!!

So, I've had UTIs consistently for 3 years straight. I get a break of maybe 2-3 weeks in between infections. I always end up on antibiotics because simply cranberry juice and water have never been able to fix it. I've tried D-Mannose, it has never gotten rid of my problem but has helped in stretching out the time in between infections as long as I take it daily. D-Mannose is not exactly cheap! Recently I got a UTI where my symptoms have been inconsistent but now have remained in my system for a month. Before I make a trip back to the hospital for more antibiotics, does anyone have any advice on other options? What can I do to fix this?! Any natural health tips to aid my immune system and urinary tract / bladder & kidneys. I've used almost every antibiotic you could think of. My immune system is destroyed. My body is so tired.. Please help!! * I have NOT had access to insurance for some time, so I have not been able to visit a doctor about any of this. My insurance will kick in on February 1st. So, I then may be able to see a doctor! I currently rely on the hospital's ER for antibiotic prescriptions. *