My advice is going to be on the Mental/Emotional Health aspect of what you writen, Why? because i too really suffer from self doubt. It may come from a different location but it is still self doubt. Changing your career is scary as hell, especially when you have children to think of. But let be tell you this, next time you have one of your dark moments, tell yourself not only are you following your dreams (which will make you happier and in the long run your family happier) but you are doing something MORE important..... You are teaching your children to follow their dreams! The hard times, the failures as well as all the good times and wins of striving for your goals will teach your children the valuble leason of not giving up and to just keep striving for more, to be better, to follow your dream!! And that, IS AMAZING! You, are an amazing mama x
Very best of luck to you (i don't work digitally, so i'm not much help to you i'm afraid lol)