MJ, I didn't have any SE's from Flomax either but there are several potential side effects such as abnormal ejac, dizziness and stuffy nose. For me, I just don't like to take any meds unless absolutely necessary. Since I was able to have normal urinary functions w/o it, I quit taking it...it was that simple.
Re your burning and frequency, do you know that the Flomax is helping it...i.e. have you stopped the Flomax to see the effect? Also, have you seen a uro in addition to your GP re those SE's? They sound more UTI-like to me than long term post brachy effects...
Jim