The PTs used iontophoresis to inject an anti-inflammatory (likely a steroid), directly onto the pain. This, while making my back feel like it was on pins and needles for 10 minutes, relieved the pain immensely, so I didn't feel it anymore. Once I got to Chicago, I got re-diagnosed with sacroilitis, and started 8 weeks of PT, complete with iontophoresis. This pretty much healed the problem, and although I would get occasionally get flare-ups, repeating the exercises I'd learned in PT would calm things down again.
... until about a week ago.
The pain has been getting worse and worse, despite the exercises and the aleve I've been taking. I was in enough pain at 9:30 in the morning, just sitting at my desk that I was pondering going home already. Instead, I made a call to the doctor, and she was able to schedule me in first thing after lunch.
I adore my doctor: she's nice, friendly, around my age, and generally a pleasant person. After a two minute visit, she confirmed what I already knew -- my SI joint was unhappy. I walked out of the office with a handful of prescriptions -- litererally! She wrote up an order for a series of x-rays, some tylenol-3, gave me some samples of prescription strength Aleve, and then also wrote me out a prescription for a year's worth of allegra, allegra-d, and flonase for my allergies, so I can send them into the mail-order service. I also had to have blood drawn, to see if something there was the culprit.
So now, after stopping by the hospital on the way home for the x-rays, I have 15 tablets of tylenol-3 (well, 14 now) thanks to the wonderful guy at the outpatient desk who offered to run my prescription upstairs to the pharmacy to be filled while I got my x-rays taken. Alas, he wasn't there when I left so I could thank him.