eyes clamping shut??

Hi everyone, I just have a question I would like to ask, if related to autsim, I'm not sure :/
I have had this probelm for about 3-4 months now, basically, randomally and unsure the triggers but suddenly my eyes would flutter. they would non stop blink, to the point its hard to see. my sight goes dark and its like seeing the brown fuzz if you have your eyes closed for too long (if that makes sense?) being aware my eyes are blinking I should be able to see, atleast a little? but with that speed, I can't and then my eyes clamp shut. I can try as hard as I would like, they dont open. I pry them open with my fingers but it hurts, so I try not too. but its scary! when my eyes are clamped its like Im falling, I cant do anything but wait it out... it hurts and tiring even though I'm just sit waiting. Like Im using all my energy on nothing? After 5 minutes to I think the longest was 3 hours. They open but I get blood shot eyes if that long, Im soo tired after, and its like Ive been panicking for hours - but all I can do is sit... Im terrifed of what this could be. it may not be related to Autism but Im scared to what it could be?
if you have similar experience could you comment. I feel like I'm the only person who does this, even the doctors say its impossible? which I've never understood becuase its happening?

thank you for reading xx