Thanks, when. I had a look on NHS websites. They really don't want you pestering GP's unless you've got a raised temperature with your chest ache, or new symptoms. I haven't either of those and, since I've had the symptoms off and on for about twenty-four years, I think I've exhausted the current medical ability to do anything about them other than what I'm doing already. Sometimes one has to just accept that things are incurable and let them pass. It could be a lot worse. I have a vigorous immune system – over-vigorous perhaps, which may be part of the problem – I've never had a serious illness (not even flu) and didn't need various vaccinations (e.g. rubella, TB) when tested because I was already immune to the diseases.
I really appreciate being able to talk to you lovely lot though, so thank you from the heart. I usually bottle it up and just cope as best I can. It's a relief to moan sometimes. 
The Ventolin (four more puffs) is helping and I can feel the progression. I'll be OK. It's just frustrating not to be tearing around the garden at the mo with a saw or hedge-cutter or scythe. Things are getting a bit wild(er than usual). The hedgehogs will be happy 
Thank you again, gransnetters!