One question first please--have you had an MRI of your brain and blood work to look for other reasons for your symptoms?
I had an MRI brain scan some months ago as part of an investigation for Parkinsons and am due a DAT scan for the same reason next week. I had Bloods tests several months ago as part of an annual checkup. All clear except cholesterol.
In that case I agree this is from stopping the flupentixol instead of tapering off it.
I think your symptoms should resolve over the next four weeks
Let me know if you need any more information please