It's totally normal to feel depressed after a panic attack. Your body temporarily has a mind of it's own (atleast that's how it feels) and the effects of a panic attack are exhausting. What I've started doing is after a panic attack or a very stressful time, I MAKE myself get up and do something...anything. I do tend to just lie around immediately after a panic attack because it is very tiring, but I don't lie there for hours feeling sorry for myself anymore (and I'm not saying that you do) Do something "light"...watch a funny tv show, play a game, anything to get your mind off what you just dealt with. Distraction is a wonderful thing. Fifteen minutes ago I was on the verge of a panic attack, but instead I decided to get on the computer and see what's going on. No panic attack :) I do realize that I can't always "short circiut" my panic attacks with distraction, but the more I can, the better I feel. I guess what I'm saying is maybe you can distract yourself from the depressed feeling the way I distract myself from the panic attacks and anxiety.
You mentioned hockey...who's your favorite? I'm from Buffalo and a HUGE Sabres fan, we could talk hockey if you want. I don't know everything about the game but maybe talking to someone that's interested in the same things as you might help with your "funk". Get you excited about the things you love, distract the things you dislike (ie: that depressed feeling)
Cheer up, it will get better!