So the doctors visit was fine in the end.  Having nerved myself up to battle for my right to be tested, I went in and did my opening explanation and she just said "Yeah, fine, lets get you tested out.  And while we're at it we'll check a couple of things like blood glucose too".  Quite brusque but until they've done the tests there's not much point in talking around it, I guess.  Anyway.  I can't have the test until Monday week because of being in Norwich (after I remembered I was free on Friday I tried to rebook it but they don't have any Friday afternoon appointments) and then after that it'll take a week before it gets back, probably so I still have a while to stew but it's a start.