i have been feeling VERY breathless for over a year now like i cant inflate my lungs properly and i feel like im going to die, i get ectopic heartbeats ( palpitations) been to a cardio for this he said they are benign, my b12 is low 147 and my iron is 15.3 I have been on B12 injections now for 5 weeks, not helping, the dr put me on iron tablets, but my iron is normal right? im so confused, im 24 a little overweight but i feel like i cant excersise now because i just cannot breath, its not panic attack breathing its constant.