I am curious to know if you had a history of depression before 11 years ago? Welcome to PC by the way. It could be you never fully grieved the loss of your father and now with a break up, which also requires a grieving process, it could have triggered unresolved grief. I know you never get over a loss like that but the goal is to get to a place of acceptance where it doesn't cause depression anymore. If you had no history before then maybe some grief counseling and therapy would solve the issue. Even meds are sometimes used for people who get stuck in grief. So many things can be sub conscience we are not even aware of what is going on.