I'd go to a Critical Care walk-in office or the ER. You'll feel so much better if this is taken care of. And I can't imagine waiting until Monday!
If you can't find someone in your communtity to drive you, you could always call a cab. (I would think that would be cheaper than an ambulence, unless your insurance covers the ambulence.)
Also, I'm SURE your husband will understand about camping!
I'm so sorry you're feeling bad! UTI's suck!! You have my sympathies!