It sounds like the police, at least, were somewhat reasonable. Anyone restraining you physically, as you describe, is guilty of "false imprisonment," and can be subject to arrest. If anyone earnestly thought you were a danger to yourself, their only recourse would be to call the police. Your son has no right to put his hands on you.

It does sound to me like your psychologist's conduct was not what I would be willing to accept. I hope you do find someone to see who will act differently and be supportive of you.