I have since 1985 had problem with then they throughts mitral prolaspe. They put me on inderal and cause side effects lt started out with severer head hurting, vomiting and they admitted me.Two days later they took me to surger6 for a cyst on my ovarie.I came out with difficulty breathing and chest pains.They said I was to young for heart problem and the pain got worse up my left arm and shortness of breath.They end up calling more doctores and did a echo and I heard him tell the nurse he hadn t seen anything like that before my heart was zooming and I was quiet and lying still. That when they put me on inderal and if I done something strenuou s it got worse.Now I am 58 and it s not a dam thing wrong with you.But I keep praying someone knows what this iscausing it has wrecked my lit and family I went to a new cardiolgist today.l and. He says she appears to have primarily inappropriate sinus tachycardia.although there does seem to be some element of Pitts. She has multiple symptoms not sure they re. all related to a cardiac cause however she does have