Hi,

You do a lot of driving. Can he take the bus? How many more months before the braces come off?

He is fifteen. He needs more responsibility around the house.
He can do his own laundry (and fold his clothes and put them away), keep the kitchen clean, start dinner, take out the trash, and vacuum.
You should ignore his messy bedroom.

Does he have any opportunity to exercise? Exercise helps tremendously with mental health and overall health.

Regarding how to handle your own stress . . . Exercise and get enough sleep. Hire anyone you can to help out with any household or laundry duties.
Do you have your own therapist? You can find someone who is trained in relaxation techniques.
Good luck.

M