Stomach Flu🙄🤒

I thought I could avoid it this year but sadly I couldn’t. I work part time at an arbys and my manager the other day got sick at work and I’m pretty sure I got it from her. But anyways, I have been throwing up off and on and I have runny stool, but recently my stomach has been feeling super tender right at the top of my stomach just a little wats below my breasts. Is it something I should be concerned about?