34f. stomach tightness, breathless, lump feeling in throat, immobilising. endoscopy&stomach ultras clear. symptoms appeared after eating blood pancakes and get worse if iron supplement taken. can you think of any mechanism why iron would cause this?

some patients do not tolerate Iron supplements specifically Iron sulfate. There is no specific reason for this, but switching to iron gluconate might help. If iron deficiency remains an issue and you are not able to take oral preparations, then you can received it via an injectable form. This needs to be discussed with your PCP

I can only think of GERD even though your gastroscopy was normal. Stomach tightness and sensation of a lump in the throat can occur with stress & anxiety, but I can't rule out GERD as the cause in your case where food or iron may precipitate the reflux.