What Causes Heavy Feeling And Pain Around Head Post MRI On Head?

Okay, Today I had a MRI did on my head area. I came home and was tired, I sit in a chair and slept for awhile. When I awoke I had a heavy feeling around my head, It hurts ( in a not really severe way) when I walk. Just don t know what all the pain is from. I have never had an MRI before today. So I do not know what is normal.