I'm on day 3 of 810, re-started on Saturday. I have the most horrendous headache which I can't shift but worst of all I'm feeling sick after having the porridge and soups. It wasn't like this first time round. Any thoughts as to why? My water intake is around 3 litres a day so I guess I need to up that. It's just the sickness is putting me off. Thanks for any advice.