I'm six hours behind you at the moment, and in the middle of a busy day, but will input again soon as pos.
Hopefully there will also be a professional or two with some knowledge of your problem.
EDIT for quick questions.
Re the time of year and timing factor, is there a trigger–like having been in cold air–on the way home from work for instance? And the big one is do you smoke? [ 80% of sufferers do.]