hi, i have a heart condition, arrythmias and have a pacemaker in, the last few weeks my symtoms have gotten a lot worse, i have more palpatations, breathlessnes and chest pain/discomfort. my pacemaker is designed to slow my heart down but recently i have been having a lot of tachychardias. i am exhausted all the time. does this mean that the pacemaker has stopped helping or could there be something else going on, can you help, thank you!