"What would cause my feet to hurt after eating
How soon after eating
do you feel the pain? What are your postprandial levels? If I amp up over 175 mg/dl postprandial I get airplane feet [prickly/tingling], a warning sign from my body.
"My diabetes is under control and my blood sugar
numbers and A1C are perfect (5.9)."
An A1c of 5.9% equates to a daily glucose average of 123 mg/dl, not 'perfect'. Perfect would be between 4-5%.
Have you seen a Neurologist?