School Stress

I'm extremely behind in my classes right now due to recent events causing my quite a disconnect with the things I find comfort in (reading, writing, art,ect.). I have a tendency to feel fine about my lack of work for weeks and then get waves of extreme anxiety and worry how I will pass. I'm going through loads of anxiety due to this at the moment and just thought I could share it here. My heart is beating so hard it's giving me a headache, I'm typing as fast as I can because my hands are shaking, and I look like I'm about to cry (red faced). I honestly don't feel that I can do anything about it at this point, I can deal with anxiety when it's mild, but full blown I have no control over the situation. I can't stop playing the what ifs in my head and I'm so overwhelmed I'm getting dizzy...I can't find anything to help me calm down because I have lost interest in the things I find relaxing.