Swelling?

I tried a new Step class tonight. I stopped about 30 minutes in because I noticed my extremities were swollen and red. My hands were so puffy they actually ached.

I cooled down and drank a bunch of water and decided to go home.

After about an hour I was back to normal.

I got to stop taking my blood pressure med about 2 weeks ago and have been checking it every other day and it has been fine.

Do you think it could be related to that? Maybe the workout was just too intense - even though it didn't seem like it was?

Or is it as I have always suspected and I am allergic to exercise?