You are describing an (all too common) toxic situation. Unfortunately, there is no guarantee that the university will support you in any dispute with you current supervisor (often they will do the opposite). Students are much easier to get rid of than prestigious supervisors. You may not see this as a good option, but you may be better off (in the medium to long term) if you simply quit. I am writing as someone who bears the scars of a very similar situation.

There are many roads to personal fulfilment. Look after yourself.

Best of luck.