[Sanitariumite]

I think I might have strained something, so I wanted to see if this sounds familiar to any of you guys. I tried a new rep/set method I read about in Muscle & Fitness where you do 3 sets of 7 reps at a heavy weight, and finish with a 4th set of 25-30 reps at a lighter weight to help build strength. I did my 3 sets of 7 reps of squats at just over 200lbs and felt fine, and after 23 reps at just over 100lbs I had to stop because I thought I was going to pass out. It's this throbbing pain in the base of my skull, right where the top of my neck starts, it was so intense I honestly thought I might black out. This was 2 nights ago, and both yesterday and today anytime my heart rate is even slightly elevated (Riding a my bike on level ground, walking up/down stairs, etc.) It starts throbbing. It's some of the worst pain I've ever experienced, and I don't know if it's a headache, or a migraine, or if I strained something. Does this sound familiar to any of you guys? If it's not better within 2-3 days I'm going to a doctor.