Damn TK, I thought you were telling my story. That is exactly what happened to me and I was unable to return to work. I was not a mechanic, but it was a tough time. Hang in there bro. This is what I did. I was able to use my experience and training to take a job (lower paying, unfortunately) as a consultant in my field. It worked out because it gave me another reason to put my life back together. This is the reason why I took up leather work because I could not play golf anymore. After the reconstruction of both shoulders, I was unable to reach above my head and to date, my left hand is still asleep most of the day with constant pain. No more golf. But I am glad to be alive and just plain having a reason to get up every morning. So, look at teaching or consulting in your field. You just have to change course in your mind. If they are willing to pay for school, do it. I wish I would have done it instead of sitting at Starbucks everyday, all day. Yea, I know....TMI!
I'm done.....good luck and if you need to talk, just let me know. I don't have a problem telling other going through your situation how to stay on track and learn from my lessons.
Good luck friend and may the lord provide you peace.