Can someone help me figure out weird sensation I had after leaving the gym?

I was driving home after a workout when I noticed something very wrong with me. I was getting a little light headed, and I stared getting pins and needles first in my head, then it moved down toward my torso and abs. After a couple minutes, it started to intensify into my arms and legs, so I quickly pulled over and started walking around. My whole body could barely function, and my hands had a death grip on my keys and I could not open them. After a few minutes, the symptoms subsided slightly, and I went to my doctors. I told him I had used a pre-workout supplement that day, which contains a lot of caffeine, and he came to the conclusion that it was that. But I always use that pre-workout, and never had I had a bad experience with caffeine. That day I was working out legs, doing squats and lunges. I noticed that when I would do lunges (in squat position with the bar on my back) I would get a small pain under my tail bone, and when I would rack the bar, my arms would be intensly tingling. So my question is, could it be the pre-workout that caused the stiffness and pins and needles, or could it have been something to do with the squatting and lunges? I highly doubt that it was the pre-workout since I use it all the time, thanks