Did i kill my father??? Psychiatrists...anybody.... please help me..?

Your dream signifies the events you had during your life, the dark tunnel meaning you were going through a troublesome time in your life and choosing the wrong choices to make and the trees are those problems becoming and growing larger as you go through life, your father on the cliff makes you think he was going to take his life as common sense would take it(seeing someone on a cliff being a symbol of suicide) and thinking that he has had many problems and not being able to go on, trying to slow your pace could have meant that you tried to change but couldn't and those actions continuing caused your father to fall. I wouldn't say that it was your fault that led your father to his death,drugs are a major impact in a person life and they can cause horrible changes to someone, if your still confused and worrying i would recommend seeing a professional to talk about your problems.