Anxiety :(

Recently I have had multiple anxiety attacks before getting on the bus before school ( I’m currently having my seventh day off in two weeks because of this ) and I don’t know what to do, I have only got three days left at my current school and then I have to change campuses ( my school has to campuses 7-9th grade then on to senior at a different campus and I missed orientation today because I couldn’t even get in the car without crying, shaking and almost being sick. I don’t want to miss anymore days of school but it’s not really something I know how to control yet, my mum keeps saying I brought it on my self and talking my way in to it but I think different 🤷🏼‍♀️ so any tips would be greatly appreciated because I’m worried I will get on the bus and have one there or at school. ( I’m also currently losing my best friend of 13 years which is not helping )