Hmmm... I have a great PCP who would have tested me immediately for a UTI. Any female with burning urination and frequency should be tested first thing for a UTI. They are extremely common in young women, and the test is quick and inexpensive. Definitely makes me wonder about your current PCP.
As far as the process for finding a new doc, I too have been to a major teaching hospital (I've seen docs in several different specialties), and I didn't have to go through a review board (although, I don't necessarily think that's a bad thing- the more heads, the better). Some specialists did require a referral and others just scheduled an appt. for me based on my symptoms/prior diagnosis. I would say that it is definitely worth a shot going to a teaching hospital. I've had some "difficult to diagnose" issues that have been successfully diagnosed and treated at a teaching hospital when I couldn't get properly diagnosed or treated in my home town (my Meniere's Disease for example).
I hope you feel better soon, and I hope you find a PCP who takes you seriously.
Hugs - Austen
"There is no charm equal to tenderness of heart." - Jane Austen
Fibromyalgia, 2 back surgeries, Meniere's Disease, 30+ kidney stones, GERD, IBS, Asthma, Allergies, Endometriosis, Heart Arrythmia, Myofascial Pain, TMJ, Bi-lateral sacroiliitis.