Thanks for writing your query.
It will be helpful if you give more information on :-
1. Whether your husband is alcoholic?
2. Any history of head injury?
3. Any history of neck pain?
4. His job profile?
It can be a possibility that he might be having cervical spondylosis
which might have increased due to working whole day and have resulted in dizziness
You should get him investigated for :-
1. CT/MRI head and neck.
2. Blood test
He can be Cinnarizine
25 mg thrice a day along with Domperidone
10 mg once a day.
I would also suggest that he should be clinically examined(preferably by a Neuro Physician).
I hope this is helpful to you.