Hi Kayla,
Anxiety is difficult to deal with but Holly and Britt have given you some great tips.
I know for me personally, breathing exercises have been helpful and so has writing down things. I do not have an anxiety disorder but everyone gets anxious about things (I'm anxious at the start of every semester as well) and the main thing is to know that this anxiety will pass and you will be fine once you are back into your school routine.
I hope this helps.
Take care.