I've also got a phobia of wrists.It's got to such an extent though that now i can't go to bed at nite with my wrists facing down on the bed because it makes me panic.It relates to pulses as well as taking my pulse from my wrist is basically unheard of but i don't mind feeling my heart beat through my chest weird hey?
It pretty stressful though as i can't really put my hands on the desk when typing because i know my wrists are touching something, also if i go on a sunbed the same problem arises!
Dunno when it all srarted but i wish it would stop as it affects me every day!Hope you're having more success with your phobia,mail me sometime if you ever get this message.bye.