One more thing -- maybe this is just the lawyer in me, but if you ever DO get sectioned I can tell you that the best way to get out is to demand your right to have the sectioned reviewed by the MHA tribunal. It's usually very informal. The trick to getting them to let you go is to show up reasonably well-groomed (shower, clean clothes, they seem to like when women wear a bit of makeup) and then say you agree that you're very ill and you need treatment. Say you'll take all the drugs they're giving you and work with them to find a solution, but you find the hospital environment very stressful. It helps if your parents/partner will come and say that they would be fine caring for you at home.

You don't have to believe it in your head, you just have to say it so they'll let you out
I always wished somebody had told me that before I was sectioned. If I ever advise clients on MHA challenges, I want to be able to tell them that . . . even though it's super-duper unethical.