SI just perpetuates utter gloom. It doesn't make you feel better for very long and then, irony of ironies, you feel worse!
I get sick of life too. It's an easy thing to get sick of, seeing as you can't really take a time out or a vacation.
Keep on keeping on, friend, because that's really the best thing to do. Keep talking to us also, because sometimes getting it off your chest is another good way to make things seem a little lighter.