Day 13 and I've been crying all day

I feel so fucking depressed and literally crying my eyes out. I remember the last time I tried to quit, I relapsed after 2 weeks because the feeling of depression just got so bad. Days before this have been quite easy, except for the first four days. Is this normal? I feel like I'm going crazy. Like all of the supressed feelings are coming to surface and filling my head with sorrow. Has anyone else experienced anything similar and does it get better?