Any idea on what this could be?

I’ve struggled with this for years. For prior context I do have other medical conditions that do disrupt my sleep (insomnia/CPTSD), but any information regarding those two yield no results on these episodes.

It is very random but I will randomly and suddenly wake up violently disoriented/dizzy, fatigued, and freezing cold. My body won’t stop shaking even if I put on multiple layers and the only way I am able to stop this is to take a hot bath (showers do not work, I have to be fully submerged).

I’ve heard of nocturnal panic attacks and seizures but I don’t wake up sweating, nor do I really think I’m having a seizure. I don’t have nightmares/terrors when these occur.

Any pointers are highly appreciated