Anxiety Attqck

Italya • periods suck lol
Okay so i recently started high school last week. I was actually excited because you know a new chapter in my life right. Anyways, I think I have been having anxiety attacks during school. My hand starts to shake and my heart beats fast and sometimes i sweat. It usually starts after my ride drops off my cousins and starts making her way to drop me off. Then when she comes to pick me up it goes away. I get that im nervous though. Im not used to it and there are quite a lot of people. I have been diagnosed with anxiety and actually take medication for this. It has never gotten this bad though so im kinda freaking out. But anyways, I need some advice. Is this an anxiety attack or not and what can i do to stop it. Also, should i tell my doctor? pleASE HELP