Hi Chilled,
I've read a few of your posts and just want to offer my support as well. I want you to know that there is light at the end of the tunnel.
I was also agoraphobic for pretty much 8 years. I didn't really leave my house for 6 years. It was hellish. I didn't drink so I coped by shutting down my feelings/thoughts because, as you know, they can be so overwhelming.
Reactions to our thoughts and to things around us (whether that is conquering the shower or going in to the basement) can be so magnified.
Long story short, that is no longer the case for me. I didn't have any medication (couldn't go get any) and no therapy BUT the mind heals. Now, i'm all for getting any help you can and encourage you as others have here. If you can go and seek that help tomorrow please do. There is no need to live the way you are, I know it's hard to do but there is help available.