If he doesn't give consent for you to receive information from his mental health team then you cannot properly support him - and there is a danger you will get dragged under. He needs to understand that.
I supported an adult DS through two sections, the last one after a suicide attempt. He lived with me, even with support from the team and full information sharing with them and the GP, it was bloody hard. I was the one having to sort medication at short notice when he forgot to re-order - so being able to talk freely with GPs receptionists was vital. I was the one driving him to appointments as he lost his license, for 3 yrs my life revolved around supporting him.
He lives independently now, he did live with his brother and family for a few months, but they were unable to continue, they both worked F/T and he wasn't working and became nocturnal, sleeping all day and waking them at night, they have small dc so it just wasn't sustainable.
You have DC to take care of, which means taking care of yourself. Like being on a plane with the oxygen masks coming down - you can't help anyone if you can't breathe yourself - so please make sure that you are OK. The strain of living with someone with MH problems, that causes them to be sectioned, is huge. Please take care of yourself.