Whilst I'm sorry I can't be very helpful and supply an answer, I can understand what you are going though as I have very similar experiences.
I will often jerk out of just-falling-asleep violently, as though I've just been defibrillated, or I will jerk awake out of a dream and wake up in the middle of a panic attack feeling sick, shaky, dry throat, irrational, etc.
In fact, I am typing this now because I just woke up in a panic after one hours' sleep!
As far as I can tell, with me it is anxiety related, and if my anxiety levels are up, I'll have more episodes of this. When I'm relaxed, it happens less often (though it still happens.)
I honestly don't think it is a psychic or paranormal occurrance, I think it is entirely a biologically based reaction to a psychological state. (Psychosomatic - though that word can have negative connotations as it has often been used to tell people they're making stuff up.)
SOrry you're having difficulties
Take care of yourself
Robin