My fault?

Today my bosses boss came to the office and greeted everyone but me with happy enthusiasm.  I guess a bit of explanation is in order.
Over the past year I have missed 14 weeks due to my depression with the last time being committed to a psychiatric hospital due to a suicide attempt.
My stay at the hospital resulted in a change in my medication by a professional in the field of depression instead of a GP doctor.
Now I am feeling sad due to the perceived or real snub.  I need to get out of this quick before I drop into the depression hole again.
 
JP