i do!! :]
"Everything is Alright" by Motion City Soundtrack. They're an indie punk band. here's part of the lyrics that sound a lot like SA...
Cause I hate the ocean, theme parks and airplanes,
Talking with strangers, waiting in line..
I'm through with these pills that make me sit still.
"Are you feeling fine?"
Yes, I feel just fine.
The "talking with strangers, waiting in line," describes me well, lol.
Actually the whole song does, haha. ...

wait.. that's not funny.
D:it's sad. =[
another song by them is "Modern Chemistry." It doesn't describe SA though, but depression, which I'm also a victim of...
"I barely have the motivation
They say I suffer from a lack of seratonin
Synapses,they happen too infrequently for me
To be functioning properly
I took the pills
I took the advice
The panic stopped
But still, I'm not right
Racing thoughts and wasted time"
Those are the only songs I know of, sorry. :0