wonder you are burned out. You leave at 6:00 A.M. and get home and 8:00 P.M. every day. That just isn't sustainable in whatever chose field your choose. I am a CPA and I have to do that plus time on Saturday, but I only do it for 3.5 months.
So reading your post, your jobs is stressful and you work too much. Do you feel your compensation isn't what it should be for the job? If you could handle the job for more pay, ask for more money. At your age, I would tell you not to change careers. You'd be starting over. I'd try to maximize your income at your current job or look for another closer to home with equal pay or one with the same commute for more money.
Lastly, do you have low T? Your attitude, motivation, and energy could all be affected by your testosterone level. Get it checked.