Sweating a river!!

Curious to see if anyone else has this problem. When I work out at the gym, I end up with sweat literally dripping off of me. I usually do an hour on the elliptical and then do weights on the machines. After about 30 to 40 minutes I am soaked clear to my waist, and then it will drip off my arms where they are bent.
I have been convinced it is because I had a heat stroke the first time I was in Viet Nam, but have been told that this is not normally a cause of excess sweating. I have lost over 70 pounds since I first started this journey and it seems to be getting worse. I had lost about 40 pounds before I found MFP.
It's to a point that it's embarrassing and I would like to hear if anyone else has any ideas.