Vitamin D and B12 deficiency. I do nw?

I was falling I'll again n again since few mnths n got whole body checkup. And found am deficiency in Vitamin D got is 5.5 and B12 is below 5O. N consulted d doctor n took 3 Uprise D3 injections and alternate days and ME12 injections for 5 days n den took tablets Uprise D3 for 3 week as weekly once and taking ME-12OD tablets everyday one.. Earlier my periods was regular and now after after starting this medication I got first tym for 23 days and again for 25 days with little more flow.. Is it because of medication which I am taking ? And after I started the medication I started getting dizziness sometimes. Can u tell me what shld I do nw ? Still on the medication so I didn't get tested again. My triclicyrides r high too like it's 250 My Iron level is 65.04 and TIBC is 363.42 and Transferrin Saturation is 17.90 Please help me out from dis. Thanx in advance