I forgot what exercise I was doing like two weeks ago, but I had the worse migraine ever in the gym. I definitely wasnt breathing correctly and got it from that, now for the last two weeks I had to take a pain reliever before the gym and carefully watch my breathing or I will suffer a terrible headache. What causes this and is there a remedy? Did this happen to anyone else, It happened to me a long time ago and I had to take like two weeks off of training heavy... what gives with the gym headaches ?