Dogs and L-Selenomethionine

Since I have upped my Selenium intake to 400 mcg of L-Selenomethionine I have more energy.

Something is happening just over my pubis, 2nd Chakra. On the first day some kind of itchy rash appeared there, gone the next day.
Now I feel power coming out of this place. The backbone position has also changed. I was lying down at one point and jumped to stand up, a jump using only the tips of one hand. Did not do it on purpose! The phone rang and I just jumped to get it. Effortlessly. Kung Fu style!

Downside : On waking up I find cramps in my calves, like I had two dogs biting them.

Anyone knows why and what to do?