My wife, age 49, a smoker, 5 3 , 155 lbs or so is having unusual heart fluttering, she feels a bit dizzy, hard to focus her attention. Not particularly nauseous. There is a specifc spot on her sternum she says is like a pulled muscle (not painful but not comfortable). She takes myloxicam for knee arthritis. Takes one a day vitamins. Nothing else. The unusual hear beat & dizziness happens off & on for the past few moths. Prior to today she had felt pretty good for a few weeks. Today is an unusually dizzy / rapid heartbeat. Any suggestions?