Just a couple thoughts. $1000 for the refi cost seems really low, are you including all of the costs? Are some of the costs rolled into the new mortgage?
You might also check what you are paying in principal for the current loan vs what you would be paying for the new loan. It seems like the extra payment you are making for the 15 year might be a lot of principal.
I realize you are looking for a way out of a bad job but overall over time you'll be paying much more interest if you refi into a 30 yr loan. Just something to consider.
Can you find another, less stressful job, even if it pays less?
As I said, just some things to consider.