his hands were shaking pretty hard in that video. looks like it might be rough goings for him right now. i forget, is it shakes when you haven't had a drink recently after drinking heavily for a long period?
It starts that way. Also really bad night sweats, legs involuntarily jerking when trying to sleep, and extreme fitful insomnia. Also, psychologically, you feel EXTREMELY emotionally raw and anxious beyond all reason... like on the brink of bursting into tears for no reason (which is why I called it feeling like being a steel wire under extreme tension feeling like it's about to snap at any moment). This is just based on my experience. That's exactly what is happening with him, I can see it plain as day in the way he moves because I've been there many times. If you were to ask him to spread his fingers out and hold out his hands it would look comical, like Parkinson's.
For the extremely heavy users this can proceed over the next handful of days to hallucinations, nausea to the point of vomiting, and eventaully seizures (DTs etc.) and then even death. I severely doubt Styx will get anywhere close to these symptoms though, as they require being a really hardcore (as in, all day long from the moment you wake until the moment you pass out) drinker for a very, very long time. If that were the case it would be more evident on his past streams I think. I drank a fuck ton for a very long time and I never got any of those types of things, just the symptoms in the first paragraph. That being said it's no joke - it can literally kill you, it's one of the few withdrawals that can. It's not like heroin where you just feel very sick and shitty but will surely be OK (I've never done that shit and I'm sure it feels bad to stop but I know for sure stopping can't literally kill you like booze can.)
If I were him I'd be driving down to CVS ASAP and getting Vitamin B1/Thiamine (it's cheap and ubiquitous), and taking a heavy fucking dose the next few days. This isn't some homeopathic nonsense mumbo jumbo either, booze strips it from your body and brain and blocks your ability to absorb it, the lack of it causes a lot of the extreme symptoms. They'd 100% be giving it to him at the hospital in heavy doses too if he were to go right now (along with something like Ativan to calm him). The lack of it for many years is a primary cause of alcoholic dementia in old people who've been at it for many years too.
If I were to guess, in all likelihood, he'll just start drinking again because the discomfort will be too great. It really is an awful, awful feeling.