How Can Depression Along With Insomnia Be Treated?

I got into a Bad motorcycle accident in 1999. I spent 30 days in a coma & had a bad brain trauma. was told I had bipolar & took a Depakote pill daily for years. In last December 21st. at work a road caused me to flip a garbage truck, hit my head & knocked out. Spent the night in a hospital with a concussion/wearing a neck brace/released next day. A week later although NO Citations the company I worked for 3 1/2 yrs. released me & hosed me outta Unemployment. I started looking for a job (No-avail) & started getting angry & down more &more. Went back to Mental Doctor & put back on Depakote. Well, here we are 1/2 thru 2017, I STILL cant get a job & my depressions SO-BAD I m having trouble sleeping, feeling as a wronged-unwanted man (always been good,uncrimminal & great at work) ,arguing with my girlfriend (lives with me) and wondering WHY I ve cheated Death 2 times-still here & am wishing I was/would Just Die......Tell me...Have I done damage enough upstairs so bad I ve gone INSANE ??