Anyone know what this is? I wake up May once a month or two months feeling like I'm hungover nauseous, groggy, a vheadache and aching neck and shoulders. It can last up to about 3 days - then goes and I'm fine. I can't work out what causes it and why I get it.
I react to certain flavourings and preservatives in food so I try not to eat too much processed food in my diet and I don't eat much white bread or sugar