Because it’s a service that requires significant research and time, I would anticipate that most vets would charge a consultation fee, as they won’t be able to assess thoroughly without providing history & doing an exam. A full assessment would require an in- person exam.
Definitely bring footage and know your husbandry practices and history so you can tell your vet. . If you call in advance and discuss the issue, they may have a better idea regarding whether an exam or consultation is called for. I lean towards an exam. Bring a fresh fecal sample- ideally within 8 hours of, um, production, and keep in the fridge but never the freezer.
Brief mention- temperature shock can also cause ‘twitching’ and even death. Just skimming (I’m babysitting my niece), it definitely sounds like pesticide or other toxin exposure should be strongly considered. Also musculoskeletal problems can sometimes be misinterpreted as neurological in origin, so footage for the vet is a must. I once misinterpreted a broken scapula in one of my leopard geckos, and trust me, it’s super embarrassing when you’re a vet too. 
I am a retired dog/cat vet, but it sounds to me like either a consultation or appointment should happen shortly. Neuro issues generally need to be evaluated and (if needed) treated quickly to minimize risk to the patient.
Just in case you need it: