I was in the classroom and I was looking at the dashboard, and all of a sudden I heard a woman screaming... I just didn't know what to do... I panicked and looked around. At that point I noticed that it was just me.
The second time I went to the kitchen at home, and it happened again I heared a woman screaming... I stood still for 10 seconds, then looked around.
What is it?
A... woman... screaming? Just a thought. Probably a bit farfetched but there you go.
Seriously though, go and talk to a doctor. Just get normal causes ruled out first.