Moonlocks, I dont know if you have made your choice yet, but I think that separation simply leads to avoiding issues. I would recommend that you get yourself a copy of the Michelle Wiener-Davis book, The Sex-Starved Marriage, and a copy of the 5 love languages. There is a sex starved marriage forum that might do you some good to check out on here.
I think that the therapist is a great idea, have you thought about using the DBing coaches? I have used them, and I think that they can give some great advice, and they come at it from a perspective that can be hard to find from a counselor.
I guess I gave the wrong finger to the wrong man...