I suffered severe depression with uncontrollable crying and suicidal thoughts for months as a direct cause from my brain injury.
About 10 months after my injury, I literally felt most of the depression lift out of my body and mind. It was the strangest feeling I've ever had, and one of the best ones

. I don't know exactly what helped - maybe just brain healing. I do know that the SSRI I had been taking did not touch the depression (I had been taking it since the 2nd month). The SSRI might have helped with the severe anxiety though.
But that said, I feel like I am close to "normal" with the depression. I still have bad days, but nothing like before.
It takes work, but it does get better. Take care.