Why Oh Why?

I'm in a bit of a strange mood (stranger than usual if that's possible!)today and I'm not sure why. In fact I can't really describe how I feel, sort of empty and drained and a little bit sad and confused by this because nothing has happened to make me feel this way.
I'm sure that any self respecting psychoanalyst would have several theories of why for me to choose from, all of which no doubt have equal invalidity and are based on vague definitions of the human condition.
I think part of the problem is that I feel continually let down by other people who make promises that they then don't keep or who are really good at crossed communications where their speech and body language don't agree. In fact I think that I am losing the ability to trust people, and because I can't trust people I can't let them get close, because I can't let them get close I then feel isolated and lonely.
There's only one solution to this and that's FTW, and if you don't know what I mean FY2!