I ve been achy all week, upper half of my body. This morning I felt like I had the flu, achy, tired,headache on left side that goes into my left ear. I ve been sleeping alot today. Ended up with 100.6 temp. A short while ago I got up to use the bathroom. Got very lightheaded,nausea and my body became drenched in sweat. After a few minutes that feeling went away bur I still have slight headache and left ear hurts. Left side of lower back is sore. Could it be a heart attack? Should I go to the er?