I can feel so much pain from that description and I truly hope you are doing well mate!
It was hell. But I enjoy my life now, and I learned many lessons in that time. My past is part of me and I can use even my past for good. I try to be a role model for the people that deal with depression around me (and maybe later academia). There is very good news for people with depression: Once one decides to get help, there is a lot of well-researched therapy (& medications if needed) around. Chances of recovery and depression management are high. And it is a field where great progress is made.
Thank you for you wishes! I can only encourage anyone with depression and similar problems to seek help - it does not bother the therapists and can improve life in ways not imaginable!