vitamon d

This past year my Vitamin D has been trending downward. On my last set of labs it was 17. Simultaneously I having been seeing some anomalies with my white count. Specifically my lymphocytes. Anyone have any ideas? WBC 8.4. (4.0 - 10.5 x10*3/UL) RBC 6.13 (4.50 - 6.50 x10*6/UL) Hgb 16.6 (13.0...