But right this instant, I'm feeling rather ambivalent about the whole thing.
If it makes you feel any better, I suffer from an intermittent anxiety disorder which expresses itself very similarly to what you've described. Even during the few weeks that I've been getting to know and understand poly, I've reached points of ambivalence regarding the whole thing.
I think the problem for me is that I just get emotionally worn out. I'm filled with a mixture of excitement and worry and sexual tension all the time, and I vacillate around between them very rapidly. This, coupled with opening myself up to being attracted to new people (and the NRE that comes with it) has, on occasion, just completely worn me out.
Maybe it's not the same thing, but it struck me when reading your post that I've been feeling sort of the same way.