According to the description you provided
(“instant, severe muscle spasms in both
arms and severe headache”), your father
could have experienced some type of
seizure(s). Seizures can be due to many
causes but originate from inside the
brain: tumors, infections, vascular
insults, trauma etc. Diabetes is a risk
factor for experiencing vascular brain
insults. Your father must visit a
neurologist immediately to describe this
episode, seek a diagnosis, and then begin
any necessary treatment.
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