Hi , I have been to the ER so many times for faint feeling, weak limbs, muscle spasms, fast heart rate or irregular heart rate. I am worried something is wrong with my organs, maybe my heart/kidneys..etc. The last Dr at the ER told me to ask my DOc at my next appt to request holter monitor for my heart. I am really lost. I've also had back pain everyday. I wear a copper iud as well, I have worries of copper toxicity. Please help!!