I was rubbing the back of my neck and fucked it up severely

This morning I was rubbing the back of my neck and felt kind of like a pop and heat radiating from my upper trapezius, kind of like the worst crick in the neck of my life. It hurt so fucking bad, probably as bad as when I fractured my arm as a kid, I think 8.5 on a the pain scale. I couldn't move my neck at all without making hurt noises, and usually I have a high pain tolerance. You get the idea. This was about 4 hours ago. I waited about 15 minutes hoping it would go away (because trying to get the Advil hurt like a bitch), and when it didn't I took 3 Advil. Once they kicked in I was at least able to move around, and a few hours later I took 2 more Advil and 3 Tylenol (I don't make a habit out of taking that much of either of those and I almost never take Tylenol). Now, it feels more like when I sleep on my neck really poorly, it doesn't hurt when I keep it straight or turn it to the right but when I turn or tilt my head to the left it hurts. I'm worried that as soon as the pain meds wear off it will hurt just as bad. WTF did I do to my neck and how do I fix it? 19M