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breathlessness, my recent b12 was 600 and active was good, have started some iron in last few days and heart rate better as well as breathlessness, however experiencing more tingling in feet and legs, and legs heavier at night, not sure whether the iron tabs causing this or my thyroid which is stillbreathlessness, my recent b12 was 600 and active was good, have started some iron in last few days and heart rate better as well as breathlessness, however experiencing more tingling in feet and legs, and legs heavier at night, not sure whether the iron tabs causing this or my thyroid which is still 
