I agree with zara about diet and the arthritis and biting sensations. I found out I was allergic to several foods and once I was desensitized to those foods my body/joint pains disappeared.
It's odd that zara mentioned smoking... I still smoke.
zara, is this the video you are referring to?
(if not, let me know so I can edit/erase it).
Itwl,
~jonsi