Pain top left of leg and left buttocks, pain now bottom of back and tightness in right buttocks now, think from the gym is this nerve or muscle damage?

Without an exam, I c. cannot say in yoru particular case and.... the sciatic nerve runs in that pattern and is a common source of pain. http://www.nerdpocalypse.net/back%20pain.html links to a lot of info Just For You as well as direct links to be able to ask questions to me directly.