hi & welcome!
sounds like you're dealing with a few issues there so here's a little question for you...
what can you change today?
it might be stopping all junk food at the door. it might be standing in front of the tv & doing a walk or exercise dvd each day, even for 10 minutes. it might be starting to get yourself used to the idea of making friends....
there's loads of things that you can do without causing yourself stress due to your phobia.
anyway hang in there you'll find new friends here & who knows, you might find the courage to walk out the door & go for a walk around your block one day!
kaz