school

I am 15 and am doing my junior cert in school I have anxiety and depression and due to this I have missed well over the 20 day allowed for appseneces I have been out for 3 day this week and I am dreading going back in every morning I cry for 30 minutes and the days I stay at home I cry even more due to missing school does anyone have any tips on how to get in to school and stay in for the full day . my teachers and principal all know and they not to pressure me but have all told me I must get at least an A or B in their class I have 10 classes so I am expected to get 10 A's or B's