I'm sorry you are struggling so. Remember that school in itself can be stressful, on top of everything else. I remember having heartburn for a week before a major biology test.

I can understand your anxiety, but I suggest you look for ways to try to calm yourself down--such as listing positive thoughts and not dwelling on worst-case-scenarios. Listen to relaxing music. Look at relaxing pictures. Take a nice warm bath or shower. Get your mind on good things such as positive memories, etc.

You will be okay.