This is Dr. David
sorry to hear about your dad
yes, you should seek medical care for him
he could be having a early serious infection or heart problem or something else
shakes and chills and slight fever can be serious in a 76 year old man with diabetes.
you don't want to overlook something serious or life threatening
they will check his urine and chest xray and blood work at the ER emergency room right away and be able to find an infection if he has one.
I hope you can convince him to go to the ER
let me know if you have other questions.
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