Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.
Good luck.
If you have people you can out with AFTER work, who you can be soft and gentle with, this may help you compartmentalize your behavior DURING work to just the job without it spilling over into your personal life.
Perhaps select a therapist who is nothing to do with your department?
And go slow on opening up about your anger?