What just happened?

I think I just had a blackout

I'm currently in a holiday apartment in Austria, the place is a bit run down

I made something in the old microwave and noticed that it smelled burnt. When it was finished, I held my breath so that it wouldn't smell so bad and then I fainted.

Then I came to and it was as if 1000 beams of light hit my eye. It took me a moment to realize that I was lying on the floor. I shook my head and stood up. Now I feel a bit dizzy.

Does anyone know what could have happened to me and should I be worried?