What does it signify if your rbc, hemoglobin and hematocrit are low and have been for at least 6 months?

It is called Anemia: You should send us your lab results. From what you have described, you have Anemia which can be caused by many different reasons including excessive blood loss, Iron deficiency or lack of blood formation due to another reason. You should go see a medical doctor(Internist preferred) and request evaluation and further testing to find the cause and treat it.