I had a UTI while pregnant with DS. I think I had back pain (isn't that bad that I can't remember that far back!) I did not have the stinging sensation (which is why I initially thought it wasn't a UTI) but everytime I needed to wee, I felt like I needed to push like I was in labour.
I couldn't get onto my OB, so went to the GP (had been a few days already) who did the urine test and put me on Amoxil and told me to get some Ural from the chemist. The Ural was disgusting stuff and made me feel dizzy, so I only had the one drink. I switched back to drinking the cranberry juice instead.

Hope you are feeling better soon Missy, and if you are concerned, maybe give your midwife a call again.

Nic