Hey buddy, HD men don't have any special hold on the feeling pissy cause your needs are not being met. HD females have just as hard of a row to hoe, and even harder in my opinion. But this is not a whining contest...:)

One thing I wanted to respond to is the not expecting your spouse to change. This is baloney. If you entered into marriage with the notion that your wife would be the exact same person at 25 (or whenever you married) as she is at 45 or 65, then you are the one to blame for your unhappiness. This is not even reasonable!
People change and grow all their lives. I never expected my husband to stay exactly the same as he was (although I would LOVE it if he would magically turn into that guy again) but I do expect him to meet my needs, as I expect MYSELF to meet his.
He doesn't have to be as horny as he was on our wedding day (banging my head into the keyboard as I type that) but I expect that he will desire me and want to be with me frequently.

I don't think it is the changing that bothers you so much. It is the fact that she changed and refuses to meet your needs AND SHE DOESN'T CARE ABOUT THAT. The not caring will tear a person up inside. If she frequently showed some sign that it bothered her that you were unhappy and that she recognizes what she is doing, I'll bet you would have an easier time of dealing with it.

Have you ever expressed to her that her burying her head in the sand and pretending it doesn't exist hurts as much as the loss of sex?