might just be the drugs. they can have negative effects long after you've stopped using them. please see a doctor.
i've been an addict, both drugs and alcohol. the first year clean is crazy for dreams. it does get better, but i still think you should see a doc. you may actually be convulsing in your sleep.
If you are having seizure activity, it's easy for a doctor to spot. The dream like state may be the result of an actual generalized seizure, in which you lose control of your body but retain partial consciousness. The twitches could be partial focal or myoclonic seizures, which you are completely aware of. Either way, find out ASAP, because the presence of these could be a danger to you and others driving, riding a bike, swimming, doing anything at heights, holding a baby, holding sharp things, etc. The doctor will believe everything you said above, because they describe real symptoms.