<s>[INST] i am having afib and erratic heart rhythums, shortness of breath, weakness in muscles, now im having trouble eating. how long do you go before going to er. last time they gave me a few carvediol and said there was nothing for them to do but they never stabilzed the heart rhythum. [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Beta blockers intake may can cause decreased appetite. You have to rule out what is the cause for atrial fibrillation? Is it structural heart disease or vascular problem or electrolyte imbalance etc?? Hope I have answered your query. Let me know if I can assist you further. </s>