Hi bondgirl,
I had a lovely bout with UTI after a long plane ride this summer...sitting down for long periods of time and dehydration are both causes of uti's, and my glass of wine with the plane dinner along with the seven hour trip gave me a good dose of both. The doctor that I saw once I got there (this was in England--I must say one of the most highly effective health care systems I've ever seen!!) he actually "prescribed" cranberry juice and some mild antibiotics...You can even get cranberry pills if you get sick of drinking all that cranberry juice. It clears up pretty fast, but if you have blood in your urine, you should see a doctor on Monday.
I don't think that the ECA stack would have caused it, but I don't know anything about a connection there. I usually take an ECA, about two weeks at a time, but I wasn't taking one at the time. Anyway, obviously I'm not a doctor, but thought this would help.