Thinking this isn't reality. Any ideas? Help

[Vancouver]

So I recently talked to my friend and she talked about what's been going on and I have no idea if it could be a disorder, over-active chemical etc... She said:

"I keep thinking this isnt reality. Like i see or hear something and I think this isn't really happening, I must be dead or re-living my life in some kind of continuous circle."

"It makes me cry and feel sick, and I can't breathe."

"Like I'll have some happy memory and I think 'wow I must have thought of that cuz im going to die soon."

"It got really bad at one point where it would happen during the day randomly and I would just become completely unable to function
like in the middle of a show, or cooking or walking."

She doesn't like sleeping and nighttime because that's when it kicks into high gear.

Does this sound like anything? Can anyone help with this?

[INTP]

http://en.wikipedia.org/wiki/Derealization

does this seem to fit?