Hi Nate ...
Sorry to hear your feeling that way ... its a horrible feeling, but I guess it all depends on what you're feeling scared about as to how to tackle it.
If it's something tangible I try to rationalize my way out of it - what am I scared of, why am I scared, how can I overcome it - The other day I wrote a post here, it contained some stuff that scared the bejesus out of me, so after letting it fester into a full on panic attack, I edited the post and everything back to normal.
If it's something less tangible I try to change my mindset, read a book (guaranteed to put me to sleep in 30 sec. LOL), go for a walk, watch a movie or play a game - anything that I can lose myself in. Its amazing how fast that feeling dissipates when you're do something you enjoy doing.
and sometimes I get really mad at myself for being scared of things and rush head long into what ever is scaring me.
I am scared of heights - so I went bungy jumping LOL Still scared of heights but I now know what it feels like to fall, and its exhilarating
I am scared of snakes - so I went to the petting zoo and got them to wrap a python around my neck - what the heck was I thinking !!! get this f*ing thing off me !!!
Sometimes it works, sometimes it don't LOL
Hope you are feeling some relief soon