Hi @mazkat Welcome to our head and neck group although most folks would rather be somewhere else. Diagnosed as anaemic. I can't say that is common a year out although I would ensure your thyroid levels are near normal. The thyroid is often damaged from radiation and results in various maladies such as overactive heart or possibly hypo lethargic feeling often confused with anemia. If that has been eliminated in your diagnosis then the doctors can dig deeper.
Typically anemia is an early sign of cancer as your blood supply is feeding the ever growing cancer. Many patients, myself included complain of lethargy for months prior to the finding of cancer. Post cancer however, your body is working overtime to rebuild internal damage from the radiation and at times, the chemo itself. Most post radiation patients complain of loss of energy for roughly two years, again, myself included.
I realize I am not helping much here. I would question how the docs arrived at anemia given what you have just been through. I am not a doctor nor do I play one on television, but that doesn't mean I don't have a scientific opinion. Good luck on the search where the sun does not shine and I hope it turns out clean as it were. Gage your long term recovery from cancer treatment on a month by month basis rather than a daily or weekly measure. Typically seven years for many issues to subside is considered normal. I wish you good healing.