Al,
Believe me I know how you feel. I feel the same way A LOT! Kim and Dave are absolutly right though, that's what we are here for. The feelings that we are a burdon on those we care about stem from our own feelings of worthlessness.
Your friends are there to help you. That's why they are your friends. If you are anything like me you would think nothing of helping them or being there for them if they needed you, and surely they don't mind helping you through a rough time of your own. I have to remind myself of this CONSTANTLY, so I can certianly sympathize with your feelings, but this is a fact.
You are not a neusiance, you are simply going through a really rough time right now, and you need a little help to make it through. There is nothing wrong with that. That's what friends are for, and that is what we here are for.
Here's hoping things look up for you. If I was a religious man, I'd pray for you.
Be gentle with yourself.
Eric