My husband states that when he woke up this morning he became very weak and began to sweat profusely. It took several minutes (appreciate 30 minutes) to cool down and feel a little better. Past history includes a heart attack with 3 scents placed approximately 11 years ago. He is 55 years old and about 280 pounds, smokes cigarettes. Should he be concerned? What might this be? This happened a couple of times a few months ago.