Hi there! I’m just over 2 weeks into stage one, and your symptoms sound exactly like mine in the first few days! The first day I had a terrible headache/stiff neck and body aches and I vomited up my dinner the first night due to the headache! (sorry tmi). The next few days I felt so sick with headache/nausea, I actually thought I had a virus until I saw my naturopath who told me its normal. Anyway I found taking a hot bath with himalayan salts or epsom salts really really REALLY helped, and drinking alot of water.
I still feel nauseous alot, and hungry because alot of the food choices make my stomach turn, weirdly. I kinda wished that I had eased into the diet rather than go cold turkey, but the worst is over and if anything that sickness at the beginning motivates me to keep going – no way do I want to go back to square one!
Best of luck!