are you on any medications? you should probly see your doctor and ask about medications or if your on meds talk about increasing the dosage. About your father you suggested writting a letter to him but as you say he interprets things differently and u cant help it how he interprets it. Best thing i feel is talking to him in person or over the fone and explain to him that you cant help it that ur suffering from depression. If possible you should get your counciler or doctor to go with you when you tell him. It gives them a chance to explain whats going on and gives him a chance to hear it from a professional. It worked with me and my mom. Your dad sounds alot like my mom. Probly the sooner the better in this case.