What can I do when hemoglobin is low after getting a surgery such as a BBL?

I had a BBL done a month ago, after the surgery my hemoglobin levels dropped and I had to get a blood transfusion. After the transfusion I was feeling way better but a month later I am starting to feel very tired, dizzy and getting frequents headaches. What do you recommend I do ? Is hemoglobin going down normal to occurr after a BBL ? I am concerned about my health and would appreciate knowing what i can do to feel better.