I think that's probably due to mindset. I've been depressed to an extent before where it impacts my mood and my want to do anything, and I suppose if you let it go further, it could begin affecting you physically like with you. I just never let it get to that level.
I wouldn't immediately regret arousal as my primary symptom though; if it got to that level, I feel there would be more pressing matters first.
But it's not really a surprise. After all, if something of a romantic nature is what triggered it, of course that emotion would be impacted the most by it.
All I can say is, unless you stumble into something good by total chance, the only real cure for it is a change in mindset; otherwise it might just only get worse.