Hi Lucinda, My 2 cents worth, What I do when stessed or bored is hop on my keyboard and write or make a website, poster, something creative always works for me.
www.myspace.com/brendanokeefe
I wrote this song on myspace when I was working out what kind of music I wanted to do after a 5 year break from songwriting.
If i get into writing something I can go hours/days and time stands still.
I find creativity stops me from eating, drinking and I get a real high out of it.
Otherwise as mentioned above, retraining you mind is the key. You get hardwired into habits and you need we need to rewire with other behaviours.
Later,
Brendan