amisulpride drug can be discontinued suddenly?

So I’ve been taking it for 4.5 years and I don’t feel effective so I’d love to leave it. on the internet, a doctor said it could be left without sudden withdrawal symptoms. This is true? I’m taking 800mg of it

I switched from Amisulpride to Olanzapine last year. But I didn’t do it suddenly. In stead, I used a half-half method to make the transition smoothly.

No I don’t think so. What the hell kind of pdoc is that? I take a minimum dose of 200mg and even if I stop that I get severe anxiety and tension in my jaw. Plus my symptoms come back.