Alan, Get some well needed rest. I agree with the others, take your wife and go on a week cruise, one of those that all you have to do is sleep, walk to the food buffet, and relax in a chair on the deck.
I have looked back on the money I have spent on my Challenger and asked why, but just look at it this way, the money is already spent and you cannot change the past. So just do a little more planning with your future income and get some relaxation, you need it. I think your car is VERY, VERY nice. You should just enjoy it as it is and not worry about spending any more money on it unless something breaks.
I know this may be a little hard for you to do, but you need to start looking at taking care of yourself and not worry so much about everyone else. Now don't get me wrong, but you try to help everyone else so much, that it may be part of the reason you are so burnt out. Just a thought.