Connecticut Valley Hospital

This happened two years ago when I was 18 and me and a group of friends went exploring in the abandoned parts of what used to be a mental asylum at Connecticut Valley Hospital. There was seven of us (guys and girls) and we were all skeptics.

Like almost any abandoned building, the place was super creepy but upon entering I instantly got this inexplicable feeling of despair or fear or something I can't really describe. We explored and although everyone was seemingly brave it was obvious everyone was at least a little creeped out.

After about half an hour I volunteered to stay by myself in what we thought was a patients old room. My friends had been gone about five minutes when I got another inexplicable sensation. I felt nauseous and apprehensive. Suddenly the room started spinning and I fainted.

At almost the exact same time two of my friends (one guy, one girl) swear they some sort of shadow or shilouete that suddenly disappeared. They claim, it was like the shape of a human but apparently saw no features. Freaked out, they decided to come find me and leave.

Unsuprisingly their fear only increased when they rushed back to the room and found me laid out unconscious on the floor. Apparently without wasting any time one of the guys grabbed me, threw me over his shoulder and followed everyone else out.

I came to once we were outside and was able to walk back to the car.

Once we were driving home I happened to glance at my watch. It's a genuine Rolex Oyster Perpetual, a gift from my grandfather. It had frozen, at what more or less must have been the time when I collapsed and my friends saw the figures.

I've posted this story on other sites so I should clarify some points that have been raised already:

This was to primarily explore the abandoned Connecticut Valley Mental Hospital, it was not a ghost hunt, although he had heard some stories about the place which no one believed.

I've never before or since fainted in my life.

The watch wasn't broken from the fall. It had stopped but was working again soon afterward. It winds automatically and shouldn't have stopped at all. Also, the watch isn't old and is in good condition.

I 100% believe my friends saw something. The two couldn't lie that well.