Hi welcome to the health care magic This time Also presentation is with cough and fever.. Hence respiratory tract infection should be ruled out...like pneumonia or bronchitis... For that chest x ray and CBC done for preliminary work up If needed sputum examination and culture can be done and accordingly antibiotic or suitable medication according to report can be given Take one tsp turmeric powder with milk daily Vitamin C lozenges useful As you have diabetes, chances of respiratory tract infection are more Take care Consult physician for examination with keeping all this in mind and take regular treatment for diabetes like that by oral hypoglycemic drug.. Hope your concern solved