Im so scared.

For the past few weeks i have been having visual disturbances. Anything from flashing lights, blurred / double vision & blind spots. I have been to my GP a few times and he has reassured me my eyes appear to be fine. He named a number of things which could be causing / play a part in this. But this morning not long after i had getting out of bed i had such a horrible experience, i felt as if i wasn't in control of my eyes (if that makes sense) i felt as if they had a huge strain on them, and though i couldn't move them. I felt as if i was been forced to go cross eyed, and started seeing double when i tried to stand. This lasted for about 2 - 3 minutes.
I have been to the out of hours, but i am no further forward...

I am really worrying as to what this could be :(
It has really shaken me, and now my eyes feel weak. I am so scared of it happening again.

If anyone has any help / advice i would really appreciate it.
Thank You x