You had a very traumatic experience with them. Personally my doctors have respected my privacy but considering what you went through I don't think anyone would blame you for not trusting them. If you cant trust the doctors they may not be very helpful as you will likely resist treatment and have a lot of friction.

It sounds like they bullied you into getting admitted. You may have been able to refuse and make them obtain a court order. The burden should be on them to prove you are a danger. Someone can have suicidal thoughts but not be a danger. It's a symptom of depression. The law gets tricky though. From my experience medical doctors are concerned with vague thoughts but when there is a specific plan they may feel you are a danger. I was hospitalized once after talking to my therapist. I was honest and at the time I did need to. I admitted myself so it was easier to get out when I found the hospital was not the treatment I needed.

There are over the counter medicines that may help your depression. Like St. Johns wort or supplements. They may not be as effective and your options could be more limited, but it could be worth the try if you are in a bad place and don't know what else to do.

Have you thought about group therapy? Maybe being able to talk to people struggling with the same issues and building a support system you feel safe with could help you.