Something's wrong with my brother...

[Chronicles]

So on Sunday morning, my brother had, or so we thought, a stomach virus. Nausea, v*, d* and so on. Well today, he v* at the restaurant (This has scarred me) and was later complaining how his back hurt. My mom thinks it could be appendicitis, but that isn't in your back so I was thinking more pancreatitis.

Nobody else in the family got this sv*

Anyways, is the v* from appendicitis/pancreatitis contagious? I was sitting right next to him when he v* so idk if I caught any particles. My food came after he p*, but my soup was at the table.
I had fajitas so I had to use my hands to eat and I'm scared.

My mom just said he had dirrhea last night.

Is it normal for kids to have the sv* for 5 days?