Questions about seriousness of issues.

Hi, all. I'm active on the fibromyalgia, depression, and migraine forums here. I've got Nail patella syndrome which can result in renal failure. I've been leaking protein off and on all my life but they've said it's a very small amount.
A few months ago I got a uti that turned into a kidney infection. Since then I've 2 more. I'd never had a kidney infection before. This one that I'm dealing with now hit me on Monday but it didnt begin with a uti. It started with lots of pain in my mid to lower back and around into my lower abdomen. I've been chugging cranberry juice but it hasn't helped. I can't see a dr until week because I don't have a babysitter for my kids.
I'd like to know if its possible that the first kidney infection caused some damage to my kidneys? If it did, what should my next step be?thank you in advance.