I know, the Rx you are taking can cause Yeast infections in some. I've experienced similar symptoms, and went to the doctor, only to be told I shouldn't worry about it, and it can be caused by the moisture in my panties or clothes, and recommended me to wear loose fitting clothes more often, etc.
Another thing that I did for the symptoms- I applied diaper rash cream in the area. It seemed to really help.
I'd try it. It helped for me. Good luck.