Another hug Moreton, could you consider shorter hours at work if you are training people to take over from you. I worked well past the time I could have retired and loved everyday, but after I did retire I realised that as you get older working does take more out of you, trying to be super woman, working, running a home, being a wife, mother and grandmother all takes energy and time.
So having finally retired and found actually there is a life after work, I would encourage you to give yourself time to think what would help you cope most, and do consider reducing your working hours if you can.