So scared rn

Potentially triggering: This whole noro thing already had me in a tizzy. Last week, one of my friends explosively *tu at school right in the main entryway but luckily I was able to avoid it and fortunately didn't have to witness this. 4 others got sick that day. I had a lot of doctors appointments that week so I missed a good bit of school and yesterday I went back. I thought that the norovirus was gone from my school. Today, (I have chronic issues) I was feeling a bit *n in the morning but then was fine for the rest of the day. During my TA or homeroom in the middle of the day, one boy was taking about how he needed to lie down because he had *tu in the morning. I convinced myself that I was ok because I wasn't there when it had happened. I bumped into him in the hallway and then he rode my bus home. Again, once at home, I convince myself I was fine and go back to feeling pretty good. Well. I was having a conversation with one of my friends over text after her bball game and then she disappeared for a bit. I am a person with some anxiety and shit so I assumed that I was being annoying so when she posted a BeReal, I clicked on it assuming that she was hanging out with other friends afterward. But no. There, in my face is a disgusting pile of *v. And her smiling face. I can't fucking get that image out of my head. And I'm so scared right now; help. I asked her if she was ok and she said that she is on some meds that are making her sick but still. IT'S ALL I CAN SEE SOMEONE HELP ME 😭 I don't know what to do and it's bothering me so bad.