Ouch... I can sympathize, because I know how hard it is to relax, even when I realize my own emotional state is part of the cause of my problems.

(Um. Stop reading here if me offering advice - because, what else can I do? Offer a huge from 3000 miles away? - would bug you.)

Does it work for you to take some time to specifically relax/meditate/whatever? Sometimes breaking the thought chain completely helps me when I'm in that state. (That, and doing whatever is necessary to alleviate the physical symptoms of being emotionally overwrought... exercise for the too-hyped feeling, or whatever.)