Yes, I had like and explosion in my head a few days ago. It hurt at the time, but after the hit. My Brain function went half out, but came back after a few seconds. I ve been having weak spells Every since. This was after taking a new med. I do have bad sinus problems that makes my chest pains real bad. Upper resestpotory, and kidney Problems. The med I was put on is metformin 500. I m weak most of the time, please help if you can.