Your vitamin B12 level is not that high. Excess amounts of Vitamin B12 from food or supplements have not been associated with adverse effects. A Tolerable Upper Intake Level has not been determined due to the low toxicity of the vitamin. Doses do range from 2 to 1000µg. Recommended daily allowance for men and women is 2.4µg.
Vitamin D may decrease from certain medications such as certain anti-seizure, corticosteroids, heparin, certain antibiotics, mineral oil, and antacids; or certain disease states such as celiac disease, Crohn’s disease and Whipple’s disease. Insufficiency may cause symptoms such as bone loss, osteomalacia (in adults), and impaired Calcium absorption occurs due to very low levels of the vitamin. You did not mention your Calcium levels and suggest getting it checked. An intake of Vitamin D 400 IU is sufficient for your age. You should not go over that amount in supplementation. 2000 IU is the tolerable upper intake level for adults; however, you can be at risk for toxicity (weak muscles, weak bones, excessive bleeding, and kidney stones) if you consume supplementation plus large amounts of fortified milk / dairy products and fish. Vitamin D is available through our foods - Fortified milk, breakfast cereals, egg yolks, fatty fish, fish oils, and the sun. Sit at a window with the sun shining in for about 1/2 hour (few times a week) and that will help you get enough Vitamin D. Suggest finding out the cause of the deficiency to treat it. Hoped this helped you.