From last 4 months I am having a few symptoms of Vitamin B12 deficiency. Doctor advised me to get blood test done for b12 and vitamin D. It came out to be 194 pg/mL for B12 and less than 3 ng/mL for vit D. I am facing following symptoms from last four months High and hard palpitations weakness and tiredness all the time feeling sleepy and resting all the day lack of concentration double vision lack of interest in anything weak sense of smell weak memory I have been suggested nurokind OD for B12 and D3 fast for Vit D by my doctor. But I do not see any yet in last two months. please let me know that are these symptoms treatable and what is the stage of my problem.