Two part question about seizures

So last night I had a seizure, but I'm having a hard time with classifying what kind of seizure it was and how to take care of myself after.

Nothing really seemed to trigger it, it was just completely random. I was lying in my bed trying to sleep, and then my neck muscles tightened up forcing my head back and my shoulders kept pushing back pinching the area in between my shoulder blades. Not long after that started my eyes would roll back. This went on for about 15 minutes before my mom called 911. It then continued for about an hour. I was conscious and responsive, but in a lot of pain. I wasnt constantly jerking and twitching, it was just my muscles seizing up on me and I couldnt control it at all. I have no idea what type of seizure that would be.

And I also wanna know how I can help relax my muscles so they dont hurt so bad.

Any advice?