It is possible that you heard Ghosts,
I doubt that would be a Spirit though.
The house you are in,
was it owned before you moved in?
Also, I did some research on schizophrenia a while back.
It rarely develops in people under twenty years or so old.
It's more common in elderly,
less common in young.
So I don't think you need to worry about that.
It is possible, however,
that you are malnourished or were very exhausted at the time,
both of which can lead to delusions.
This is, of course,
assuming that there really wasn't anything there.
I would suggest Rag's Cure-"Most"(lol)
Sage to repel negativity,
sweet grass to attract positivity,