Hey ladycakes! I do have 'just fibro', and I have some spasms, but I think they are due to Restless Leg Syn. They are spontaneous and in my arms and legs, and are often in the afternoon as well as at night, but they are not as severe as yours, and never in my head or neck. Sometimes late at night my legs might jerk that much, but never during the day. I switched to Requip about a month ago and am finally getting some relief from RLS. Sounds like to me it might be another problem...certainly needs looking into! Hope that knee doesn't hurt too bad! Good luck with finding answers!