When did the shortness of breath get better for you???

Hi so my worst symptoms are SEVERE shortness of breath, I can’t exert what so ever. I can only make it up the stairs once a day if that and I’m unable to catch my breath. Horrible pots, heat intolerance to the point of not being able to be in the sun for even one minute, cold intolerance, constant crippling anxiety, weakness. It’s been low for ten years now. Last month my ferritin was 28 and now it’s at 47 after supplementing with three arrows heme & lactoferrin. My symptoms are not better what so ever…. What level did your ferritin get to before noticing improvement?