My husband has a family history of heart problems (aunt has a pacemaker, uncle had heart surgery at an early age, father has arrythmia & extra tissue on his heart). He enjoys long distance running (up to 25 miles a week) & had a strange experience the other day (he went to his knees when he experience what he described as an earthquake go back & forth across his chest, nausea & dizziness). Should he see a cardiologist or go to his primary care physician? thank you.