Returning to work with PND

I have recently returned to work Leaving my 17 month old at child care for the first time. Before I had my Baby I was very confident in my work and could achieve my role easily. However I have a touch of PND and have no confidence left. This has been made more difficult with some other staff being unwelcome to my return to work. Does anyone have and advise on how to return to work with PND and build up my confidence again.