What Causes Chronic Cough After Receiving An Iron Infusion?

I have been in hospital twice in the past four weeks for quite bad pneumonia. I was given an infusion of iron as my level was only 3. I came home but haven t stopped bleeding like a heavy period. I sm 65 and went back on HRT 3 months ago. This is the first time I have bled. But I want to pass out every time I stand up. I can t make my bed unless I lie down 3-4 times I don t understand what is happening to me. I still have a very heavy cough but no wheezing. i do not have the high temps and sweating anymore.just want to pass out all the time. Thankyou for listening. I am distressed.