I comment only on my personal experience, and that does not include loss of physical control of my body when I wake up. Of course, the doctor's input is the important recommendations.
I have a lot of trouble-mares I call them and they do seem to be cause of my frequent waking up during the night. I consider myself to have a sleep/emotional disorder, but as said never do I feel helpless when I wake up. I think some of my problems are driven by the aging processes. You obviously are not yet suffering from aging, still you may have some other emotional strain or pressure that is a stimulant. Be sure to think that through before you see a doctor. The better the information you provide, the better the diagnosis.
Good luck, you situation sounds scary an most of us don't like that feeling.
Hello and hope you are doing well.
If it is an occasional occurrence, it can happen in normal people too. If it persists it could be due to an entity called sleep paralysis. When this happens in sleep the person has difficulty moving his hands or feet. This is the symptom of a sleep disorder called Narcolepsy. This sleep disorder is characterized by excessive daytime sleepiness, sleep paralysis, cataplexy where the person has episodes of loss of muscle function while awake, hypnagogic hallucinations and automatic behavior. You will need to consult your primary care physician, who may schedule you for a polysomnogram (sleep test) to rule out sleep disorders and initiate appropriate therapy.
Hope this helped and do keep us posted.
I haven't started any new medication.
It sounds like a reaction to starting a medication.