All the other posters have given good advice - pyshcotherapy and monitored
medication is the best course of action. And yes -
depression is a chemical imbalance. It can happen due to stress, life changes, you name it.
Until then, be easy on yourself, knowing that choosing to hand over decisions to your husband or a close friend is not cowardly or lazy - it is being wise.
I wish you the best, and hope that you are feeling relief soon.