This will sound really neurotic

Last night right before I went to bed I ate some Pizza and a pretty large milkshake.  My stomach felt weird as I was trying to fall asleep...but i dont know if that pertains to eating right before i went to sleep or if it means im sick.  I woke up this morning and had a small cup of coffee.  My body is really intolerant of caffine (and i know im really stupid for drinking it anyways) but usually if i eat with while drinking it my body can somewhat handle it.  I had half a bacon egg and cheese sandwhich like an hour after i drank it, but my hands are shaking really bad and my stomach feels really weird.  I cannot convince myself this is cause I drank caffine...especially since my stomach felt weird last night too. And now Im getting this feeling of absolute horrifying terror.  Like Im scared to move or anything.  Another thing that makes me doubt its just anxiety and not the stomach bug is the fact that its like stomach bug season and I go to school and I know germs are easily spread.  I try so hard to keep my hands clean (im like OCD about it) but sometimes i will forget and but my fingers in my mouth or eat with my hands or soemthing.
ANOTHER thing that makes me doubt it is the fact that the stomach bug virus can sit in your body for like 2 days before it actually makes you sick...so while i showed no symptoms before this..i could have gotten it friday in school and now its 2 days later and i could be finally getting sick. or it could just be anxiety/caffine affecting me. AH I JUST DONT KNOW. and its the not knowing that is KILLING me! Is it more logical that its just the caffine or is it more logical that I'm sick? I can NEVER tell the diffference between actual sickness and anxiety attacks, becuase they feel the same for me.  So more than anything, I think im terrified of the not knowing. I just cant ease my mind right now