cnn, is the B12 your using Methylcobalamin?. If not, try a fast melt sublingual form of Methylcobalamin. Methlcobalamin like Hydrocobalamin is a nerve healer. As we age intrinsic factor in our stomach declines causing poor B12 absorption Also research Benfotiamine a fat soluble form of thiamine (vitamin B1) for each of the symptoms you mentioned. Thiamine plays a major role in many areas of our bodies including eyes, GI system, nerves, heart and brain. Water soluble thiamine like vitamin D requires magnesium to become bioactive and may not pass through the blood/brain barrier as well as fat soluble forms. Look into the foods and drugs you are using for negative impacts on your thiamine. Take time to research the other B vitamins as they work better together. Always consult with your health care professional before using any supplement.