I feel your pain. I was on vacation last week in FL when one hit me. I always go prepared for the yeast beast but I don't have UTI's that often. However, often enough to know when I get one.
My Dr. called in a RX for me for pain and antibiotic. I took 2 doses and the symptoms were better but I had an allergic reaction to one or the other or both of the RX and almost ended up in ER. Upon arriving home and seeing my Dr., he told me I should have been in the ER that the sleep sensation with dizzy and heart beating quickly could easily have made me not wake up at all when I was trying to rest. I had taken this particular antibiotic before (Macrobid) and had no issues. It was Saturday before I began to feel normal again from my body's reaction to the drugs.
Try to get in asap and tell then you can't wait if you can't. They do a test in the office and they also send out a culture for further testing. I am going back in 2 weeks for a re-check to make sure all is clear.
I drink a lot of cranberry juice and eat proactive stuff daily. This one hit me by surprise. I am thinking of taking some of the azo cranberry as a preventative. I also find the other remedies on here from moms to be interesting to try.
Good luck!