Well, yes, alcohol and marijuana withdrawal can cause seizures and muscle spasms. Both can affect liver and kidney function, which in turn can affect muscles and cause seizure like activity. Electrolyte and sugar levels should be checked in blood.
Apart from treatment of withdrawal symptoms, your husband should drink water, eat healthy and take multivitamin. If the symptoms still persist then he may need CT scan or MRI and EEG. Please consult your doctor regarding this. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
Your husband just absolutely positively never touch alcohol again. In the United States most practicioners don't provide anti-seizure medications until the third seizure. You have a life-threatening situation. These episodes mandate revocation of a drivers license is every state in the U.S. until at least a year has gone by without seizures. An accident with a car and a history of seizures is a felony, notwithstanding the danger to others. In addition there is the danger in operating machinery or standing too close to the edge on a train platform. Alcohol is definitely linked to seizures. Marijuana is another issue. Most marijuana in the U.S. is tainted by pesticides. With every seizure there is some brain damage. Not much, but it is cumulative. Death can take place from vomitus blocking the airway. Talk with your doctor about exactly what to do if he has another seizure. How to clear the airway, for example. The provisional diagnosis is "rule out epilepsy". Provided the patient abstains from drinking and takes the medications as prescribed most epileptics can live fairly normal lives.