Goodness - a weird contradiction seeing as you seem to have had such a good time.
Me, I'm mostly just jealous because I didn't get to go but also want to say a me too to the anxiety. Cons are pressure cookers (and other assorted metaphors) and can leave one feeling quite drained.
My anxiety is probably is still that early stage anxiety that you mention. Even tho' I've been knocking around fandom for quite a while, I've immersed myself only a little and so haven't spread my network as far as I could.
However given the high pressure, draining nature of conventions - could it be just post con blues you're experiencing?
Regards
Jim