Last night (8:30) sudden weakness, freezing and nausea combined. No vomiting. Pulse usually 60, but increased and remains (11:30 am) at 79. BP fine. Age 63. No history of heart disease, high BP, or cholesterol. Could this just be oncoming flu? No more freezing, nausea comes and goes, no sneezing, low fever?, no appetite, severe weakness. Should I see a doctor? Stay in bed? Usually super high energy (and stress), twice the endurance and strength of 20 year olds.