There are hints of instability in financial, physical, sexual and mental health throughout his life.
But there are hints of rock solid support from parents, siblings and friends. Some of his friends are good, some of them are really bad... involving lawsuit, illegal activities and love affair.
I don't think he can easily sit down for a long time, because he's physically and mentally "restless".
Some people remain mentally fit after becoming disabled, with a wheelchair. Some others, like him, are not so lucky. Their mind deteriorates if they end up on a wheelchair.