I'm really busy a lot at wk and my son is 17 and drives. Can he take himself to the doctor when he's sick home from school? And use our insurance?

Depends. Most 17 year olds have temporary illnesses that will spontaneously clear with time and reasonable supportive care. If your son has a problem requiring a doctor visit than you will likely want to accompany him to find out and give assistance. You might want to call your doctor and see what he/she thinks about the need for an office visit.
Depends. Most 17 year olds have temporary illnesses that will spontaneously clear with time and reasonable supportive care. If your son has a problem requiring a doctor visit than you will likely want to accompany him to find out and give assistance. You might want to call your doctor and see what he/she thinks about the need for an office visit.