Is it sleep paralysis or something more serious?

I know about sleep paralysis but lately it's been occurring so frequently that I'm kinda scared to sleep. its like i can almost see my surroundings yet i cant move n my head feels like someone's squeezing it so HARD n it hurts n feels like EXPLODING. but then id wake up n the pain goes away. im scared if its serious like a tumor but i dont hv headaches or any other symptoms when im awake. juz wen im asleep. is it stress-related? coz i noticed it happens more frequently when im REALLY tired or stressed out. MEDICAL point of view, please.tq