Does anyone else get randomly depressed?

I was feeling fine just now, in fact I was actually planning on going to the movies and doing my work. Then suddenly I remembered about how I failed my exams and suddenly the urge to kill myself got so strong. But I knew I failed it a while back and I as ok with it. I never felt so bad about as I did just. Now I just strongly want to die.
I’ve had this happen to me quite a few times before, sometimes even without any topic. Does anyone get like this or am I just going crazy.