Same situation as me. Mine has been going on years, but the past 2 I've been mostly housebound. I game, exercise, and write code. I feel like I'm just wasting away.

Thing is, I do keep doing it and it's not getting better. Some days I can manage to walk the dogs, other days I physically can't. Some days I'll feel completely normal and can do a 5 mile walk. My last walk was 12 miles.

It's really not easy, especially when you don't know what the fear actually is. I used to know what my fears were, but my anxiety got much much better and those fears are no longer the fears why I don't go outside.

By now I should have solved my problem. It's been 2 years of constant trying. I've left the house maybe 100 times in 2 years.