[DanBC]

You didn't say what country you're in.

If you're in England you can write an advance directive saying that detaining you under the act would be harmful, and you can work out who your "nearest relative" is and make sure they say to the AMHP "I object to the section". These don't make it impossible to hospitalise you, but they do make it much harder.

But, importantly, you deserve help. And you don't need to disclose suicidality. You can just say that you feel very low, that you feel desperate.

There's good evidence that cognitive behaviour therapy is effective for about 60% of the people who use it. You may want to think about combining it with medication.