Hi
Like you I started at 38 ( wish i had started playing 20 years ago ) and have played twice a week , including winter, since then . i hit the range twice a week hitting roughly 250 balls a time. then i go to the practice bunker for half an hour and then 30 mins on the chipping green. The rest of the time I am learning French. my wife works full time too and so find myself with plenty of time to fill in during my days off. I believe there is a very fine line between AVID GOLFER and GOLF MANIAC.

I think Greg is right. you need to take a break.
see if you can go a whole week with out touching a club at all. I guarantee you will come back refreshed. Regards....T.P.Grealey