I have really bad cystitis, please help me!

I've had it for three days now, and I have drank plenty of water, cranberry juice and barley, it has got even worse!! I'm now literally afraid to go to the toilet, and have to bring something to squeeze, it kind of helps with the pain very slightly. I have had reoccurring cystitis previously for about 5 years, then it went away for about 2 years, now I have it again and it's really bad. I went to the doctor today and he gave me some tablets to take, but is there anything else that could help?! PLEASE.