Shmoe, I've been following from the sidelines for a while with nothing different to add that hasn't already been said.
First and foremost, what phUnk said. Seek professional help. The pros are trained and can help steer you in the correct direction faster than any of us maggots could.
Second, don't think that you are without friends, or that your disappearance from this world would go unnoticed. True friends are the ones who call the cops because they can't get to your door in time to protect you from your inner demons. There are hundreds of people on this board who would be more than happy to go out on a bike ride, ski, hike or hang out and talk, or offer up space in thier homes if you need to get away for a while. The world is an amazing place, and this board is just a small sample of it. Don't miss out on it.