Hi - I have always been an active person mainly playing tennis at a good level. I had not been playing for the past few weeks but had been in the gym once a week to keep up my fitness levels. Yesterday I played a tough doubles match which lasted about 3 hours. I was very tired afterwards and 10 hours later I still had an increased heart rate even though I had gone to bed. I am 49 years of age have two children, there is a history of heart problems on my Dads side. I am also going through a divorce at present which brings its own stress. Otherwise I would consider myself to be a health person.