Until we manage to actually chat about it I will comment on your self questioning your work choices. As long as you feel that you are doing well, and enjoy what you are doing then you are okay. If you have been placed in a responsible position then whoever put you there feels you are capable of doing the job, and you have shown them you can. The lingering self doubt that rears it's nasty head at times is something you will have to work on probably forever. It's so ingrained in you that it's automatic. BUT you have learned how to knock it down with positive self talk and you'll continue to do so as each time it happens. You have the tools to overcome the anxiety it produces and you use them well.