Lynn is correct. Were you asexual, your sexual problems would essentially be a nonfactor, as you wouldn't really have any desire or intention of having those problems being...well, put into a position in which they'd impede you, so to speak.
That being said, your libido seems to be the problem here, not your orientation. So I don't think you're asexual...I think whatever's causing this has REALLY done a number on you, though I can only hazard guesses as to what. I'm still wary of the topamax and stress.
As for "poor us," speaking for myself, I do not envy your gender. I don't mean this immaturely or unintentionally offensive to any of our female posters, but between pregnancy, childbirth, menstruation (which scares me personally...I hate the sight of blood

)...even sexually, your first time is going to hurt due to the presence of the hymen (which, again, scares me). Firmly, I think women have the harder lot biologically speaking.