Bless you, Nikki, for wanting to make a positive difference in helping others with depression.
I am so very sorry that steps weren't taken to help your dear father, when he had the courage to confide his depression to the doctor.

He must have had his "brave face" on, else the doctor would surely have understood that he desperately needed help. If only, if only.
Nikki, you are courageous like your father, to delve into this information that upsets you so. I hope that somehow it will help with the closure that is so slow in coming. Perhaps now, with your new determination to reach out to others, your thoughts will be refocused and give you the impetus to go forward with your aspirations.
I'll be very interested to know what your plans are. Praying you will find direction for your energy and comfort for your troubled heart.