A trick my psychology professor taught me is this...
its called 5,4,3,2,1
the premise is that you dont usually focus on your surroundings and are too caught up in anxiety. Odds are, nothing terrible is happening to you at any given instant so by reconnecting yourself with your surroundings, you calm yourself down and relax. It takes away anxiety.
Start off by breathing really deeply. In through the nose, out through the mouth. Breathe from your stomach, and feel it fill your belly.
Once youve done this for 30 seconds or so, start the excersize by saying 5 things you see, then 5 things you hear, then 5 things you feel.
Example...
5. I see my guitar in the corner
4. I see a computer speaker
3, 2, ... etc. til 1.
then
5. I hear some cars outside
4. I hear some noise from my roommates headphones.
etc.
then
5. I feel my the collar of my shirt against my neck.
4. I feel the carpet beneath my foot.
etc. to 1
Then you repeat this with 4 times through of each. Then 3 times til finally you say one thing you see, one thing you hear and one thing you feel.
Try to pay really close attention to your surroundings, especially on the hear and feel parts. You'd be surprised how much stuff is going on right now around you that youre not paying attention to.
The first time I tried this I got so relaxed I could hardly stop myself from breaking out laughing.
Give it a shot, let me know if it works for you