I can relate to how you feel. I struggle constantly with anxiety and panic attacks in school as well. My best advice would be:
1. Tell your parents. You need to tell your parents, they'll support you! Let them know what's happening.
2. Talk to a therapist. Through personal experience, I think it's better to talk to an actual therapist over a school Councillor but it wouldn't harm talking to her as well. It's their job to help kids. Just tell her how you feel and I'm sure she'll help you out.
3. Whenever i begin to feel overwhelmed and panicky I use breathing apps to calm down. I often go to the bathroom and recite the simple breathing rules to calm down: In, one, two, three, hold, one, two, three, out, one, two, three. Do that a few times and you should calm down. Beyond blue has a voiced version you can listen too as well.
4. All my teachers know, however I'd only bother telling the teachers who run the classes you are struggling in the most. Also, if you have a stupid teacher, make sure you tell them that you don't want anyone else to know. I have a friend that I told that started talking to me about my panic attacks in front of the class. She meant well but it wasn't ideal. So make sure you just tell them to keep it to themselves.
5. Talk to your friends. Your friends may struggle to understand if they don't have anxiety but It'll be good to tell the ones you trust the most. This way you can tell them about what you struggle with and vent a little without having to worry. Just make sure you tell them it's personal information you don't want everyone to know about.
6. If your friends or someone else does become a douche about it, don't quiver up. Be strong. These people aren't worth your time if they're like that. Don't let it get to you, there are hundreds of people who'd love to be friends with you. Explore your school, make new friends!
I hope you find at least some of those useful. There are always ways to get help, including this site.
I hope everything turns out well for you.
-JustSomeGirl
