I've been a part of LOTS of leadership training through work and have read many HBR articles about this. You are absolutely not alone, imposter syndrome is very real and pervasive through all industries, all levels. Adding in the changes due to pandemic and now your change in how your work is being done, and it's no wonder you are feeling increased anxiety and less confidence!! So be gentle with yourself. Your DH may be defaulting to the standard husband "I have to help fix this problem, not just listen to it" approach.
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Mama to DS1 Punkin (2/04) and DS2 Boo (1/09)