Hi, I Have Been Feeling Very Lethargic Lately, But I

Hi,

I have been feeling very lethargic lately, but I am not sure why. I have been taking iron supplements for a few years now non stop, but they seem to have stopped working from the start of this year. My immune system seems to be weak this year, as I was sick with Gastroenteritis in February and had the flu and cold in May. Not sure if it is related or not but I am feeling constipated, and I am prone to Migraines and sore heads a lot recently. I am sleeping fine. I have also had a choking incident twice where I could not catch my breath, which was very scary, but I figured if I breathe through my nose that it helps. Anyways I am not sure if any of what I have mentioned are related but that is an insight into my health since January this year. The worst it has ever been. Have you any idea as to what may be wrong with me?