This is Dr Basu, Experienced Specialist.
I am here to address your concerns and provide great service.
These symptoms are indeed concerning.
Staggering means lack of balance.
Balance is maintained by the cerebellar part of the brain.
Lack of focus is a problem likely in the frontal part of the brain.
Temporal part of the brain responsible for driving skills.
Your husband also has diabetes.
So he is at increased risk for stroke.
Stroke can cause these symptoms commonly.
The next possibility can be the degenerative changes in the brain --examples will be frontotemporal dementia, parkinson
's disease etc.
Normal pressure hydrocephalus is another possibility as well.
Your husband should consult with a neurologist before this gets worse over time.Intervention
at right time will restore his functioning.
This important to understand.
Please discuss with his doctor to expdite the necessary work up.
Thank you for sharing your concerns with us today. If you have any additional questions or need further clarifications, please do not hesitate to ask. I am here to answer them. I wish your husband good health. Regards, ***** *****