I am a 58 yr. old female with a very healthy lifestyle. I have had an intermittant headache for about 2 weeks, worse at times. The headache feels like a sinous headache, but mostly in the back. I have tension in my jaw. Also, the last few days I am in bed no energy, feeling fever and chills though the thermometer reads normal or up to 99.5. I feel nausous, am not very hungry, and am coughing and a couple of days ago I had heart fluttering pretty consistent for 2 days. I have had irregular heartbeat all my life, but never this much.