My hct is 35.1 hgb 11.7 rbc 4.08 iron 37 i'm a female 52 yrs old i've been on a very heavy and painful period for over 3 weeks straight now.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor to exclude a non-physiologic cause of bleeding. In the mean time you should take oral iron and multivitamin supplements to replenish the iron lost in bleeding. Wish you good health.