hi,im a 38 year old women,i have been having a few problems with my heart it keeps missing a beat every fourth beat it will miss out i go vey dizzy and light headed,i have been put on 5mg of bisoprolol but it is still happening what should i do,as i have been back the docs today and he told me to stop taking these as there is nothing wrong with me i just panicking,its not the same doctor who put me on the tabs