I am Homozygous for VDR Bsm my vitamin D is 24 ng/ml (April 2013) was 13.4 at lowest. I recently restarted vitamin D supplements 5000 iu daily but am having strange symptoms start again. I am not sure if it is because I haven't had any B12 recently and that is low also. I am nauseous, lost weight again, feel achy, joint pains, slight tremor, slight restless legs need to stretch a lot. Could this be anything to do with my VDR Bsm +/+ maybe it makes me unable to process vitamin D. I don't understand what it means exactly can any help to explain it to me please?