I don't have any kids, so I don't have any advice for you reguarding your daughter. I'm sorry you are going through this, it sounds terribly difficult.
I have been in a sexless marriage. I will presume to give you advice on that: seek help. It can be devistating to your self-esteem/self-image. I don't know what your husbands problem is (my ex is gay, which no one bothered to tell me) but you are not "past it" Women reach their sexual primes at about your age.. it should be getting better, not non-existant!! I know that as a 20 yo I had to learn how to turn off my sex drive. I got rather good at it. By the time we seperated I was 27 and had learned to have no sex drive at all.. do you think that's the way a healthy 27 yo should be?
Fortunatly for my current hubby I was able to find it again, and I learned how vital it is to a healthy mind, body and marriage. I was missing out, and not in just a physical way.
Obviously I don't know your entire story or how your relationship works, but I can tell you, from personal experience, that I understand how damaging it can be.
I hope you don't take this post the wrong way, I just hate to think of any one in a situation even remotely similar to the one I was in, and had to stick my nose in.
Misty