Lesley.... we feel your pain. The first few days are horrid! I remember walking up the stairs at work & feeling like I'd run a marathon! Banging head & icky stomach. It soon died down though. I remember after 3 weeks taking stock & realising that I felt better than I had in a long time (must be all those vitamins!), my skin was much clearer too & I needed less sleep.
I'm on restart day 6 & keep remmbering those great days to keep me motivated while I'm cold & fighting my internal chatterbox that wants to eat anything & everything!
Stay strong & you'll feel great in no time. Take a look through the before & after pics any time you feel your resolve is down. I can't wait to see yours up there too!