Severe sweats chills fever no pain though

Patient: My 54 yr old wife has been exp an onset of a cough that leads to nausea and chills. this will pass and then lead to a severe bout of sweating. temps of 102 lead to the sweats. general lethargy and little appetite. no pains at all anywhere. she has type2 diabetes and her blood sugar has been somewhat elevated. overall good general health, but did have a similar bout like this 34 months ago. Thank you in advance.