DH woke me up at 7 this morning (bed at 2am) 
to tell me that he had stomach pain and felt as if he needed to be sick. I grabbed my stuff from the bathroom and headed downstairs to have a shower in case it was a bug - we tend to isolate and leave one another to it if one of us is ill to stop it spreading - thankfully have 2 bathrooms
He wasn't sick - retched a few times and went to the loo but all was OK that end. Since then he still had the stomach cramp and then had one bout of diarrohea around lunchtime - nothing again since and no sickness and says he feels a bit better.
Until 5pm yesterday he hadn't had contact with anyone other than me and the DC's - all fine - since Xmas Eve - but we went out for Pizza last night and he shared a starter with me, had a meatball pizza and gave DS and me some meatballs and again we are OK. He did then eat 1/2 large bag of peanut M&M's around 11pm and said that was all he could taste when retching [ewww].
I think (hope) he has probably got a bit of food poisoning or over indulgent tummy upset rather than a bug seeing as he hasn't mixed with anyone else since Saturday - what do you think?? Really hoping it isn't a bug 
as we have MIL coming to stay on Friday....