I think I have a UTI because of my symptoms and I have had them before but I am having pain in my lower back and lower stomach especially when I breathe, I took 2 motrin 800 for pain but its not working, what could be wrong with me?

Well, if you do have a UTI the motrin isn't going to do much. Ideally, it would help manage the pain. But it won't make the infection go away. You really need to get to a doctor, if the pain is severe and not responding to pain meds you may even want to consider going to urgent care or the ER.

Sounds like it could be a kidney stone, or kidney infection. See a doctor right away.