I'm similar to you. I am a teacher of 11 to 18 year olds but have been off work for 3 months so far due to depression. I am overwhelmed with the thought of going back at some time. I used to be able to talk in front of a room full of kids, give presentations at meetings and solve many problems that came up. I was also a 'go to' person for my colleagues. At the moment, I can barely talk to anyone besides my close family and my doctor.
I saw work as a performance. It was like being on stage each and every day and I loved it until fairly recently.
My doctor thinks its just part of the depression and I've not found Meds that work yet, just about to start a new one so fingers crossed this will all go away and I can get back to being me.
Good luck. I would suggest talking this over with your doctor. He or she might be able to reassure you that it is temporary, fingers crossed.