I was put on SULFAMETH/TRIMETHOPRIM 800/160 TABS for a sinus infe...

I was put on SULFAMETH/TRIMETHOPRIM 800/160 TABS for a sinus infection about two weeks ago. I was almost done taking all the pills when I took two Midol (the ladies know why). within an hour, I broke out into hives! At the time, I just assumed it was the midol only; I investigated and it appeared that the diurectic in the Midol caused it. Then I continued my Sulfameth that night and I woke up with worse hives. I called the doctor becuase OTC Benydryl didn't help. She suspected the Sulfameth versus the Midol. Upon my own investigation, I found on MedlinePlus.com that you are supposed to tell your Doctor if you are taking a diurectic before taking the Sulfameth! I will never mix those two again!