Wow, dude, it's bad. It sounds as if you're dad is emotionally abusing you with the inconsistency and unpredictability in mood and response. It is his way of yielding power over situations where he truly has no control. His response is most likely related to some level of deep fear, doubt, and hurt, but since he doesn't know how to fix it (or that there is even a problem), he expresses all of his emotion in anger. It is not a good situation to be in.
But running away? Naw.
It is better to seek services of the local mental health care and community services agencies, who are prepared to assist you and your family through such a tough situation. You say your mom is in a coma.....are there community social workers helping you through this at all?
Request services on an emergency basis.
Let the people in your area know how dire the situation is for you. But stick around to see what happens. RUNNING AWAY HAS A MILLION PROBLEMS ASSOCIATION WITH IT THAT ARE OFTEN WORSE THAN WHAT YOU'RE EXPERIENCING NOW. Seek help in your community. The law enforcement office willl help you, a school office will help you, a church office will help you.
There is help to alter the situation to a place where it will become manageable. Be safe and get busy on this project. It's for you and you are important!