question: For about five years I have experienced heavy palpitations and squeezing in my chest which is a result of sudden movement eg getting up very quickly from a sitting position. The symptoms are random as this doesn't happen every time. I have a history of stomach problems and experience a lot of bloating. Recently, these episodes which take about one minute to subside have become more frequent, sometimes being accompanied by pain in my calves which is a new addition to the symptoms. Can you please enlighten me as to the possible causes?