I don't know law in the UK, but here in the US, they can force treatment or place you on a hold (equivalent of section) if they feel you're not taking care of your yourself OR deemed a danger to yourself. Not getting medical treatment would, imo, fall under both of those. And where I live, if you seek medical treatment for an od or self harm, you're automatically under a hold and forced to have treatment until you've been assessed by a psychiatrist, which they can't do until you're deemed medically stable first.
So again not knowing the differences and not knowing the law well, I'd say they're will within grounds to say you lack capacity for refusing medical treatment. Especially when it's medical treatment due to harming yourself because it shows you don't fully understand the risks and consequences to what you did. And if you say you DO understand and you did it anyway, that's actually a larger reason for arguing you don't have capacity and are a danger to yourself.
Insiting you have capacity, is again, where I live, generally a sign that you actually lack it because it doesn't show that you're willing to work with the professionals or that you truly understand the consequences of your actions.
So yea, at least where I live, your choice in the situation would go out the window because you lack capacity and are a danger to yourself because of the overdose itself.
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