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As per your history your uncle suffering from diabetes mellitus
and frequent problem of headach.
Headache may be caused by many conditions out of it raised sugar levels, low sugar levels in blood, sinusitis
are the few causes your uncle may have.
For sinusitis treatment please have a visit with a ENT specialist
. The treatment may consist of Analgesics, antibiotics and Mucolytic-decongestants etc drug combinaitons
Wish You a Healthful Day..