Very naive.
I get PIP, I scored points mostly on my mental health. Yes, I had to have evidence of goijg under CMH on my record, eating disorder clinic (never inpatient), etc.
But I didn't get that treatment/support/being under CMH because I was that unwell. I was refused treatment and support of the above nature for years, I almost died of my eating disorder because GPS could not give a flying fuck. It wasn't until I met my partner who pushed for it for me. In other words, I got the help I needed because someone made a fuss on my behalf. I was too unwell to do that for myself. I couldn't leave the house for 20 years. I still am.l too unwell to fight this shit.
Whether you have that evidence you mentioned for PIP is nothing to do with how unwell you are. It's to do with how much fuss you have made (or someone has made on your behalf) to get under CMH, to get referrals accepted. All you need to do is make a fuss and boom, you have enough evidence to get PIP. The key here - you don't need to be telling the truth.
It's very hard for genuinely mentally unwell people to get PIP because a lot of what you need if based on self advocacy... Which is really difficult when you're already unwell, and if you don't have someone you're screwed. I was in a right state and had ZERO medical care. I'm getting the help now, but only due to my partner pushing for it for me.
But you could lie out your arse and make a fuss for yourself and you'll get your evidence, if you were so inclined.
Mental health care is fucking rubbish. You only get somewhere when they need to shut you up.
And for the record, I work (from home) . PIP isn't an out of work benefit. Out of work benefits are either LCWRA on UC or ESA. And PIP does not passport you to them.