[I am not self diagnosing myself]
I decided to look at three different diagnostic criteria for major depressive disorder (ICD-10, DSM-IV, DSM-V) and according to all three of them I have severe major depressive disorder so my speculation was more then correct. Those depression tests are pretty accurate all 13 of the ones that I took from six different websites.

I've been doing research for almost a year now and it only just occurred to me to look at the diagnostic criteria