Good post. I completely agree.
Sex is just one aspect of a relationship--an aspect that you two have already proved has been compatible in the past, and also that he is willing to work on by seeing a doctor and a psychiatrist. But....you don't seem to be willing to work on it. That seems to be the problem here. Maybe you should be seeing someone as well.
Also, one thing to keep in mind is that throughout a lifetime many things can interrupt your sex life. Physical illness, depression, stress, child birth, separated by distance, etc. Most of these are bound to happen in any relationship.
Finally, if you decide to acknowledge that you haven't been working on the issue, and decide to begin working on it, I encourage you to avoid phrases like "I don't like" or "I can't". No one has tried everything, every way, with every person. Maybe you WILL like it, if it's done the right way, by the right person, and maybe it will take some work to get there.