I'm 37 And Workout Regularly, Eat Well, But Have A

I'm 37 and workout regularly, eat well, but have a stressful, sedentary job. Yesterday and today, I've felt like my heart has started racing for no reason and get out of breath. Is this a typical stress response or are they symptoms for a heart problem? I think I might have sleep apnea (spelling?) and heard that can weaken your heart, so that worries me.