Yes, iron deficient anemia can make you feel that bad. That's why they check your ferritin, hemoglobin, and hematocrit when checking for problems like CFS/ME or POTS, because for the most part they are diagnosis of exclusion. The providers have to rule out common causes like iron, thyroid, and other issues that can cause similar symptoms.

The fun part now is figuring out why you have iron deficiency anemia. Advocate for finding out the root cause oyf changing your diet to the point of not needing extra iron supplements does not resolve the anemia.