I think I need some reassurance that I am not imagining things. I live on my own so everything is so much more scary. I was referred to a cardiologist 3 months ago for extreme tiredness and a heart rate below 50 beats a minute. Since then my blood tests are negative, my heart scan shows it is physically OK, 48 hour monitor did not pick up anything except a few 'blips' according to the consultant, then after taking my monitor back, involving taking 4 buses. My extremities went freezing cold then within approx. 2 hrs I suddenly nearly passed out, since then after most activities I get palpitations and dizziness always delayed not during activity (so far) which lulls me into a false sense of security until I get these unexpected symptoms, my heart thumps that much it makes me cough sometimes with pressure in my neck and head, I get extremely tired some days and not others, even when I do nothing, sleeping between 2 - 3 hrs in the afternoon as well as at night. I am now on my 3rd monitor as the 7 day event monitor the consultant ordered was defective so it did not record any of the events that I was so sure would tell the consultant what was wrong. I am not expecting anyone on here to give me a diagnosis that would be ridiculous, just need to know that I am not alone.