My father, 66, past smoker, pace-maker, emphysema and on oxygen, high BP, high cholesterol. but pretty stable and mobile. Had a COVID vaccine several months ago and had been in declining health since then, fatigue, tired, gets out of breath easily. Has recently had two hospital visits where he got transfusions but iron is still down. blood in stool, but endoscopy showed no GI bleeding. We are now bouncing back from being stabilized from the hospital with a hgb of 8, and trying to get him to his cardiologist and gastro doctors. I've found this thread because of looking for idopathic iron loss post covid vaccination. I would appreciate any help or leads, as I don't feel that the hospital doctors are doing anything but making sure he's barely OK enough to leave the hospital.