I'm sorry to hear of the continued troubles, David. RBC last approximately 90-120 days, and die off continuously, and are continuously replaced, but chemo and radiation can compromise bone marrow production where RBC are made, so fewer are made available to pick up oxygen in the the lungs, Hemaglobin, in addition too, RBC being killed off by the body or by treatment faster than they can be replaced. They may go down again in several months, sooner, and process continues, and have had a number of transfusions, epogen, shots myself from treatment, and from a metabolic disorder to raise my Hemaglobin. Mine is never higher than 10.5, usually 9.5 or less, but anything under 7 is dangerously low. But even at 8, 9, if the person is in respiratory distress it can be life threatening, and may be give transfusions at that level or when the oncologist orders because anemia can cause one hypoxia to be chemo and radio resistant.

Reglan is for nause vomiting, GERD, but it's not a antibiotic.

Good luck.