I have been in a similar position you're in: Job gets boring, you see greener grass, move to the other side of the hill... and in my case, it happened a few times. I finally realized that, at least in my case, it's part of my personality.
So now I try to keep hobbies and jobs in clear perspective. My hobbies are things I do outside of my job that I really enjoy, and (most of the time) things that make me no money. Looking forward to the hobby makes the job workable.
If it's possible, you might consider pursuing your new interest part-time while sticking with your current job, before making a hard switch. You do have a responsibility to your family and yourself.
Slashdot Mirror
So now I try to keep hobbies and jobs in clear perspective. My hobbies are things I do outside of my job that I really enjoy, and (most of the time) things that make me no money. Looking forward to the hobby makes the job workable.
If it's possible, you might consider pursuing your new interest part-time while sticking with your current job, before making a hard switch. You do have a responsibility to your family and yourself.
Good luck!