Im sorry to hear about your husband. But from what you are describing he is definitely having seizures, they are just not tonic clonic seizures in which his limbs would be moving in an unnatural manner however it is certainly posssible that he is having a TONIC seizure in which there is generalized stiffness of the muscles and his muscles would lock for a period of time. there is just increased tone of the muscles in such a situation. Now the frequency of these seizures indicates that they are usually set off when he is under some sort of stress. Usually there are various stimuli for them to be set off which can include loud noises, flashing lights, pain or even stress. Now this DOES need to be evaluated by a neurologist and your husband needs to undergo several tests which would include an EEG, a MRI of the brain as well as a complete metabolic work up.
You should be worried about these symptoms and you should make him go see a doctor, preferably a neurologist. At the same he can also have a look at his heart and do a EKG and possibly a 24 hour holter monitor to rule out irregular heart beat as the cause of his seizures.
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