stomach virus or UC related

my daughter was sick with the stomach flu last thursday and it lasted 24 hrs. A good friend of mine caught it too and her symptoms lasted 5 days. I started with very watery Diarhea on monday and I still had some this morning. what is so weird is that 1 of those days i had nothing at all. Most of the time my stomach will empty out in the morning and then i wont get anything else for the rest of the day. Has anyone ever gotten a weird virus like that? I dont think it's UC related as I don't see any blood. Ive been in remission for almost 5 years now. Is it maybe the fact that i'm on Remicade and Aza that its taking longer to go away?