Definitely join the Y!! I joined when we first moved up to GB and it has helped me make friends and maintain a schedule. You need your time to take care of yourself. You could even set a goal. I wanted to run a half-marathon and do a triathlon, and I have done that and plan to do more. I got a training schedule from one of the certified Y trainers and keeping to that schedule has been a nice way to keep my mind off my family struggles.
Seriously, hang in there. I know how hard it will be for him to face the fact that he needs therapy, especially since he's an MD and knows "everything." My husband has finally started going and I think it's helping him. One thing the therapist said, and I think it's true, is that oftentimes professionals like MDs, CEO's, etc, are really smart but lack the emotional skills most people have.
Focus on yourself and your kids. Disregard your FB friends, because everyone seems have something they are hiding. Do your best to go out and meet people in your new community. Your older daughter might benefit from preschool and then you could meet the moms there and become involved that way. I joined my daughter's preschool board of directors, which helped me meet more people.
Me 34 H 34 S 8 D 5 M 10 y T 12 y S 7-16-10
Me: 34 H: 34 S: 8 D: 5 M: 10 yrs T: 12 yrs Affair: 7-1-10 (lasted 2 months, I caught him by reading emails, there was no sign of stopping until I caught him) S: 7-16-10