It's easy to jump to a snap judgement but there's lots going on here. From your description, you've both acted like absolute dicks tonight. You treated him like a child, poked/tickled him (which he had previously said he doesn't like however you now try to minimise it) and then you goaded him repeatedly. His response was then OTT and unacceptable.
My question is - you've been together three years and you describe him as perfect, loving etc. Given what happened tonight, are there any retrospective red flags? If not, I think you've behaved unfairly.
I understand his response was a bit shocking. However, I can hand on heart say if that happened to me with a long-term DP that I loved and trusted - I'd be immediately more concerned about them passing out. I'd probably wonder whether the two things were connected. There are many medical conditions (as PP including a doctor have mentioned) that can cause a temporary and brief change in behaviour. He obviously didn't fake the passing out. Yet you're more concerned - even now - about how he upset you by holding your wrists and asking you for a serious answer to the thing you'd been goading him about. Your priorities stink.
If I were him, I'd be wondering about whether I want to stay with you. You showed absolutely zero concern for his wellbeing. The man just passed out unexpectedly and you've just let him walk home on his own. The man you apparently love and have been with for 3 years. Yikes.
Even if the two events weren't connected, you made it physical in the first place by touching him in a way he'd previously told you not to. He hasn't been violent or abusive, but his response was deeply uncomfortable. I get that. But you absolutely provoked it.
I'm saying all of this against your description of a long-term, perfect and loving relationship. If tonight's behaviour makes you view some past events differently, then that puts a different complexion on things.
There was a woman on this board a few weeks ago. Her partner was being a horrible, goady dick, and she ended up hitting him. She was remorseful and didn't hurt him, but just lashed out. Posters said to her, your behaviour was not OK, but understandable. They said to her you were triggered and lost control, you need to make sure you don't do that again - but figure out if you want to stay with him. No-one was calling her abusive yet her actions were far worse than your partner's. If there is no other explanation for your partner's behaviour, I assume the same applies to him. You were pretty horrible to him, it triggered his anxiety disorder, and he massively overreacted. He wasn't violent, but you felt shocked and scared by his response. It's absolutely fair enough to want some space, or some discussions about why he reacted the way he did, and how he can ensure that doesn't happen again. But before all of that, you absolutely should have put his welfare first, and you didn't. As a long-term partner, I'd feel massively let down by you. You clearly weren't in any imminent danger, and you've shown no concern for his wellbeing in your comments.
I would add to all of this that if your relationship continues and there's ANY repeat of his behaviour, that would be totally, totally different. But a one-off occurrence after serious provocation, followed by his passing out, in a long-term, loving relationship with zero red flags about control or aggression.....my concern right now would be his welfare.