Reticulocytes low, pancytopenia, & bone marrow destruction indicates which type of anemia?

Complex problem. It appears that your bone marrow is not making new blood, so you have anemia due to the failure of production. If you have pancytopenia then the problem is much more than anemia alone. Such situation are either due to leukemia or preleukemic conditions like Myelodysplastic syndrome(MDS). You need a blood specialist to help you sort it out and guide you further.