To make things clear, I do have a therapist that I see once in a week. I'm just here to ask something that is maybe unrelated. So

I have been diagnosed with depression back in 2013~2014. I have had a few therapists, never had any medication, even if one of my numerous psychologist told me that it was the step I missed for recovery. Anyway, I've never been really cured, but I've progressed a bit as I don't cut myself anymore. That's it for the backstory lmao.

In the beginning of this school year (september 2018) I've had enough of my alcoholic dad and decided to stop going to his house. Haven't seen him more than a couple hours since. Since then, he has been mailing me, texting me, calling me etc. Putting my moral at 0 as it was mostly insults. Because of that, my grades have dropped a lot this year. For the second semester, my grades went back up, but I still don't know if that's gonna be enough to pass the year. It would be if my grades weren't so bad in the first semester.

My finals are starting in a week. I have been sick since last monday. A terrible stomach pain. We went to see the doctor, did a scan, an MRI, bloodtests. Nothing. But the excruciating pain is growing stronger and stronger every day.

My mom is kinda forcing me to go back to school, because my exams are so close. But I'm a mess. I don't eat, don't drink, my ears hurt, my stomach hurts like hell, my head hurts. To top it all l, tomorrow is my birthday, and I won't be able to enjoy it as much as I'd like too. I want to cry all the time.

Here is my question(s):
What is going on (if it's not a physical problem because it still could be) ?
Is it a burn out ?
Is it my depression kicking in again ?
My aunt said me not eating was a sign of the beginning of an anorexia. Even if I think that's a bit over reacting, could she be right ? I mean, I'm far from skinny. I'm even a tiny tiny tiny bit overweight (like, I lose 2 or 3 kg and I'm good).

Sorry for the long post but I had to ask, thanks for reading and answering if you can.