Thank you all for all your input - it all made fascinating reading and I will take it all on board and bear it all in mind when I phone for my results at the end of the week.
AlisonMA I have been following your posts on the weigh-in thread with interest for several weeks - your experience sounds horrific and I am so pleased all is now sorted for you.
Those who have read my threads in the past will know I suffer from occasional vaselvagel (?spelling?) episodes when, for some unexplainable reason, my BP suddenly drops and I hit the deck. Normally I am 'out of it' for a few minutes but quickly recover. I feel rough for about 24hrs, then a 'bit under par' for the next 24hrs but after that I am fine again.
Following my last episode, which I admit was more intense than normal, I was rough for the first 24hrs, under par for the next 24hrs but never actually felt 100%. I am normally very active with work and my regular gym/swim sessions etc but I couldn't shake off the lethargy and extreme tiredness which is why the GP ordered all the original blood tests.
It looks like there are many of us in the same boat and the magic solution to my inability to lose weight does not lie here! I am now on MFP and I will persevere!
If I find the magic solution you will ALL be the first to know!