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Thanks sqad, I will do. Got a rhumatology appointment next month so worth a mention, they are the experts - will bring up some of the recent up and down blood/urine tests results too and maybe ask her to look at some of my older records (especially hospital admissions, viral pnumonia, viral meningitis other infections, suspected glandular fever espisodes inc the recent time etc...). I have looked things up and although it could explain a lot I think it's so easy to start ticking boxes (especially with such a widely affecting condition) and go all hyperchondriac but I'm keeping openminded generally.
Much as I don't want anything like that, I have certain problems regardless and if it was something systemic then it might help to get a link and be treated more effectively in a more streamlined way so a diagnosis, however unwanted, may assist in the long run so in a random way could help. Swings and roundabouts I guess! If it was something like that then I figure I'd only have it mild (comparatively with some things I've heard/read).