Hi,
I've just stumbled upon this forum and it's very interesting for me as I've been suffering from anxiety in recent years which has effected just about everything I do, including sport.
I've been a runner since school and have taken part in track, cross-country, 5k, 10k, half marathons (many) and a full marathon (just one!) over the years and I've recently got into triathlon as I love my bike too.
I had a massive anxiety attack in the summer and decided to take action and get some help. Amongst other things, my counsellor told me to write things down to help me get my head around what was happening to me but I've taken this a step further and started a blog so I can have a rant every now and then about triathlon and life.
http://chasethepotato.wordpress.com/
One thing's for sure, focussing on exercise and forthcoming events really helps me, but it's not always easy.