my husband had chills last night with extreme shaking, no fever, lasting 2 1/2 hrs. He still feels a little off today and a bit weak. He has been diagnosed with and is being treated for Parkinson s disease, and had heart bypass surgery about 15 years ago and is taking heart meds, high blood pressure meds. and meds for low thyroid, and eliquis for a clot in his lung. He has an appt. with his Dr. in 2 weeks. He has had this a couple times over a few years.