Fucked Over by Public Schools

I’m eighteen, I’m a senior in high school, and I’ve attended four different high schools, one for each year essentially. I’ve suffered from depression since I was eleven (due to childhood abuse), and during the beginning of my sophomore year, I suffered from my first severe flash back starting my downward spiral of PTSD and Major Depressive Disorder. During the fourteenth week of school that year, I was admitted into a private mental health facility for inpatient treatment. I was there for eight days, and right afterwards, I attended iOP which is intensive outpatient; it lasted for six weeks. So I was gone from school for seven weeks, and during that time it was in between semesters, where even though I was in the hospital, my school refused to give me my schoolwork, tests, and midterm exams (I attended an alternative school in iOP). I failed. Every single class. English 2, Geometry, World History, Chemistry, Band. I failed them all. I was in a mental hospital, my school refused to give the hospital and my mom the work for me to complete, and I failed. My GPA at this point went from a 3.4 to a 1.8. Now, I’m sitting on only needing two more credits to graduate (Algebra 2 and Economics), and I am failing everything but Algebra and Band, and my principal is saying that he won’t give me my diploma unless I’m passing everything. It really sucks too because I’m in the midst of a depression episode and I don’t have motivation to do anything. I don’t know what I should do. I’m so fucking overwhelmed and I’m starting to have mild suicidal thoughts again. I told the dean of students the other day that I’ve been skipping class because I’ve been having panic attacks. I get ISS. My principal told me today he doesn’t understand how I’m failing art classes (I’m in three art classes), but I have no motivation for art. It makes me angry. I’m burnt out from it. I’m suffering a creative block. I’m so fucking sick of my life. Nothing will ever work out. Everything just goes wrong for me.