I see a problem you've had in your relationship simply from your pros and cons.
Your wife dominated your relationship and wouldn't let you be you. Gaming and D&D is a part of you, and she should have to deal with that, and a little time with the guys away from her isn't supposed to be an issue. It also sounds like she was quite controling with the finances, and I would guess in a few other ways as well.
My live in GF is not a gamer (She thinks it's stupid), but she knows that I enjoy it, and I have a regular gaming group (Once every other week) and get to go on one gaming induced vacation a year (usually to Gencon, might be Origins next year, but who knows). It's never realy been an issue, and the time I get away strengthens our relationship. At the same time, I never try to simply say no to anything she may want to do, especialy with friends, as it's healty to have some hobbies and friends.
You'll get through this. You'll be a better man for it eventualy. And don't let yourself get down. Just because you love/care deeply for your wife doesn't mean it was ment to be. Sometimes you're better off just being realy good friends, and hopefully you can devolpe that with your soon to be ex-wife, especialy for the sake of your daughter.
Meanwhile, you should look into any custody issues that may arise. I don't know if you want primary custody or joint custody or what. Given you've had a job longer, you might be able to get full custody, should have no problems getting joint custody. Also, if she insists on you both getting one lawyer, make sure you pick the lawyer and you pay for it (Don't let her pick and you pay, that could be bad). While you could get a lawyer to represent both of you, that can be hard if there are contested issues. And if you simply use "her" lawyer, you have a lawyer representing her even though they could be working with you, and that could be a problem if many contested issues happen.
Hope this all helps
