Was deficient in vit d and b12 few years ago, would it be a good idea to check other vitamin blood tests like b3 or c or e to check cause of fatigue.?

Maybe: Fatigue has many causes. A visit with your health care provider might provide insight into the reason(s) you are fatigued. Vitamin deficiencies are not the most common causes of fatigue.

Dr Singh and another doctor agreed

Not really: B12 deficiency may be dietary or related to gastric disease. Vitamin d is both absorbed and converted in the liver and skin to active forms. Vitamin c, e and others do not have the same absorption pathways nor the same actions. Vitamin k as an example is related to clotting, while e can help skin collagen deposition. They are all different and unique in function and action.

Dr Friedlander and another doctor agreed