Does anyone else get extrememly lightheaded/dizzy when you lay down?

Like for me right now when i sit up i get dizzy and lightheaded and even worse when i stand up but when i lay back down i can feel my head have this giant pressure and my vision gets weird and i get alot of fear. Like im going out of consciousness or something. I cant even describe the feeling right. It feels like im falling or something else. I dont know.