I Am Having Mild Diareah, And Mild Nausea. It's Seems

I am having mild diareah, and mild nausea. It's seems silly, but I never have this. I had too much dinner in Christmas Eve and too much sugar, which is when this started. Not much to eat since then, and am trying to stay hydrated. Could I have a virus of some kind? I ask this because I have had 2 fever blisters in close succession and seem to be fighting off one all the time. Thanks for your help