Afterimages, Fatty Liver, Kidney Stones.

I have been diagnosed with grade 3 fatty liver in  October. Last Month my CAP was 316 increased from 304 in Oct & KPA is 6.9 decreased from 10.4 in Oct. I have lost 18 Kg since then. Last month I had a blood test done. Kidney Stone too. My B12 levels are 176 and Vitamin D levels are 17. I am taking Bilypsa, Thiotres and Vitreon Tablet once a day.  I have floaters for a long time. For the past one month I have been seeing afterimages & ghosting images. Sometimes the prolonged one is for LED and Car Light. I have got my retina checked twice in the past 15 days & it is fine. Today I visited a Neuro-Opthamologist & he thinks Vit B12 & Vit D can be the reason. He prescribed MethylCobalamin 1500 mcg once  a day for 20 days (Nuroday I am going for), D3 Shots once a week for 12 weeks & Becasule Z for Multivitamin once a day. Is it safe to take them with the fatty liver medicines mentioned above. MRI Brain (Plain) is also normal.