When I was first seeing my pdoc, I was very very scared of doctors (now merely somewhat scared, or distrustful. And I trust him now.) and yeah, he's messed up a time or two. Made me feel that powerlessness again. We didn't know each other well back then: now he would probably say things a little differently (both because he knows/understands the fear way better, and because we know each other better so he knows how to say things so I understand them) so it doesn't upset me as much, and because I trust him now.

We'd only seen each other for a month or two when I got suicidal and wasn't cooperating as he desired, and he basically said "Cooperate or I'll need to send you to the locked ward with a sectioning".
I shut down. Only asked what that meant exactly, then said something like "No!" and turned around in my chair.. eventually he left because I couldn't communicate anymore. (I was on the residential unit at that time, so he didn't leave me alone or anything. Nurse was there also.) It did get me cooperating.. it also got me very scared. Of him, of everything.

Nowadays he'd probably say something like "You understand that if we/you can't [..], you can't go home/I can't allow you to go home." Which feels less like a threat, more like an explanation of logical consequences. Also, 'his' ward is pretty great, not "being trapped in a room at the mercy of nurses" at all.. and I know now he doesn't lock people up because he gets off on it or anything. I didn't know that back then.
Also, I think he'd be less forceful now anyway because he knows I need time to process things before I can make a decision. Sometimes that's more time than average. I can't always make instant decisions. Often a minute or two in silence goes a long way, but if someone tries to convince me during that silence I can't think and thus I won't be able to agree or agree to do as they say.
Back then it was a yes-no-yes-no-yes-no thingy. Now it would probably be yes-no-you take a minute to think, while I write your new prescription.
Or yes-no-yes-give me a minute..