Thanks to every one with there advice.
I have never used protein tablets and didnt realise it is a cause of GPC. And one of my lenses must be over 2 years old!! I'm quite carefull what I use on them as many solutions/drops etc say not to be used with soft contacts and mine have the soft skirt around them. I will query this with the hospital. All I have ever used is a peroxide solution-currently boots own-that disinfects them overnight and is suitable for all contact types. Sounds like I should maybe doing more????
Update on my situation.
I collected my glasses on Monday ( should have been Friday
) and just wearing them the 10 mins home in the car made me feel a little sick ( I wasnt driving ) Tuesday I wore them a little around the house and did a short drive in the evening-realised then I could manage with them after a little time taken to get used to them. I found looking in mirrors, at junctions ( basically where you normally move your eyes rather than your head ) disturbing as things distorted, appeared bigger and I found it hard to judge distances.
My wife took a day off wotk on Wednesday and I wore them while working-she drove me about. The first day they didnt make me feel sick or give me a headache.
Thursday I worked from home-a lot of computer work but I wore them most of the time and for the first time I forgot I was wearing them mostly and got on really well.
Did a short half hour drive.
Today I have been back to work as normal though a shortened day-Only an hour or so drive to my first client. After 4 hours or so my eyes where aching a bit and I have just got home now after driving home( 6 hours wear in total).
Feel very pleased how I have got used to them. Although they are far from perfect( I have lost some confidence in driving and despite the great weather I dont think I can manage with riding a motorbike wearing glasses ) I am very pleased with how its gone and feel next week I can get back to more of a normal working week. Though maybe I will work slightly shorter days and try and avoid the longer drives for now. Though Thursday I have to go to Guernsey for the day ( leave home at 5am, get home 8pm ) so that could be a little difficult. Maybe a nap on the plane there and back will help (purely to rest the eyes you understand! )......