Yeah i can totally relate TimeHeals. I think it's also set it off for me now as after the small operation I had, the doctor told me to rest until I'm given an ok... meaning no going out or exercising. The first week I was unwell but now I'm full of energy and although there is a huge lot I can do being at home (I'm a designer so a pc& internet is all I need), my mind wonders away and when it's bad I have a difficult time switching it off.
