Wow, that's tough. Is your stutter tied to anxiety? I know mine is. Supposedly the best way to counter anxiety is by gradual and consistent exposure to anxiety inducing situations, but you probably know all that. If you can't do the group yet I'd recommend finding someone you can talk to (in person), someone that you know well enough to be relaxed with. I have that in my housemates, but I know it can be hard to find people willing to talk. Hope you can work through it.