Thanks to you both, Brains and Darlene.

I'm actually feeling a bit selfish at the moment after reading some of the various posts. My biggest concern is losing a reasonably high-performance job because of this. My standard of living is nowhere near as altered as many of the good people on here.

Sure I don't like the persistent headache, light head and bouts of nausea/weakness but I can live with that. In fact all things considered my life is still having a good run (unless the axe falls on my job!!).

Every day here is a plus, is it not?