Thalysimia/Anemia Remedy

I have THALYSIMIA. I need suggestions on ways to energize myself. I have a moderate exercise routine which I practice 3dys a wk. I eat well balanced meals & take multi-vitamins daily. I don't smoke, drink, do drugs or eat fast food. My current energy levels don't register past completing my work shift at the Post Office. I feel like a bum just sitting around in rest mode the remainder of the day, resting up for my next work day. B12 shot only worked the 1st time. I NEED ENERGY!!! Please, any thoughts on this is appreciated.