I don't really know, time I suppose. I found meditation quite useful when it was at it's worst - basically just half an hour or so with the lights off, some soothing music and just focusing on my breathing (best tip I've heard is to breathe from your diaphram, so your stomach moves in and out, but your chest stays almost stationary)
To be honest, what's worrying me a little at the moment is I seem to be getting a 'head rush' when I stand up or make a rapid movement - I get this feeling of pressure in my neck and head for a few moments. I'm worried this might be linked to blood pressure - I've got no real reason to suspect a problem and my BP was measured last time I had these problems, so it's probably not very rational. May just be the muscles in my neck tensing up (apparently this is what causes the jaw ache) - has anyone else experienced that without any underlying problems?
It's easier said than done, but after being reassured several times by my doctor that I was physically well, I made a concerted effort to try and ignore any anxiety symptoms I get. Even if I didn't always believe it, telling myself "It is anxiety" rather than "It might be....." seemed to help. Fortunately it's national blood pressure week or something over here, so they're running free checks at work, so I think I can allow myself a check up, without breaking this :)