Hi there,
You poor thing. I had something simlar - like you I was pretty scared by what had happened and the next time I went to the doctor I asked him about it...the doctor said it probably was an optical migraine. I've had a few, I guess but the one I went to the doctor for I had visual disturbances. It was like having a kaleidoscope in my eyes. Please get it checked out.

Cheers,
Jess