I can't stand up for 10 minutes at a time. Before the viral infection that kicked this off I could hike for 8 hours a day. Thanks for your very helpful contribution to the discussion though. I think I'll make my first ever use of the 'ignore' setting.
I was going to second Dr Tim Trodd, although I don't have personal experience with him. I'd be really really surprised if they haven't come across CFS before. OT&P are very good.