Woke up at 1-2am nauseous and violently shaking?

Hii I'm 18 and this has never happened to me before but I woke up in the middle of the night today really nauseous like so nauseous it kind of hurt I genuinely thought I was gonna throw up and also shivering violently. The first however-long I spent in bed, the shivering coming in waves and the nausea constant, because being half asleep I was lowkey trapped but since my house is quite small I was able to get out of bed and walk 3 steps to my mom's room and ask her to sit with me because I was super freaked out 😭 it lasted about another hour, about a half hour before the shaking went away and then the last half hour I was normal enough to try and sleep. I have a loft bed, and my mom had an air mattress right behind me, so I ended up just sleeping on her floor in case I spazzed out of my high bed and died.

The shaking was what freaked me out the most. I've never had anything like it before, it was mostly around my jaw and my back, but occasionally I got a whole body spasm. It came in waves, and eventually went away after I was laying on the solid floor for a while. It was NOT anxiety related even though I was scared.

The only major thing I did differently yesterday was spend a lot of time outside (I'm violently ginger and thus extremely pale) since I went swimming with my friend for her birthday. I put on sunscreen but still got a little burnt anyway ☹ has anyone experienced this before?