Hi, I suffered from many symptoms of B12 deficiency for the past 12 months, one of which had been breathlessness, but only when walking up a hill or slope. If I pump myself full of methylcobalamin using sub-lingual tablets and a spray, this all but disappears!
Just recently I've noticed when relaxing quietly, such as lying in bed before I go to sleep my breathing is somewhat shallow and rapid. If I take a couple of deep breaths and fill my lungs then it returns to normal for a good few minutes.
Is this a symptom of air hunger or "The Sighs" other B12 sufferers talk about? I've have no other breathing related symptoms (ie cough, congestion etc.)