The incident with your boss created trauma and is stored in your memory .Some times trauma can be stored in the body as illness.I read it somewhere. Trauma cannot be erased completely if not processed in a proper manner.Therapists help us to process and heal.In your case it resurfaced. It never went away.Something in your present may have triggered it.Please Google ANTs and how to overcome it.There are some excellent ideas from psychologists. See what works for you.You have a 2 year old.Little kids are really handful.Think in this way.Your time is very precious,you have a job and a little kid.When I have other things to do.I say affirmations to myself like these......"I have no time to waste worrying,I have important things to do".Some times these messages keep me grounded and I am able to focus .See,what helps you to get out of your head.Hugs.