Deficiency of
Vitamin B12 cause peripheral neuropathy means pain on the peripheral area body like hand and leg unilaterally or bilaterally.
On the basis of your sign and symptom as you have told that your sign and symptom like body ache and fatigue from one week.
I think that symptom of body pain should be elaborate more as- pain on the whole body or it is localized.
And for fatigue reason is can be the low hemoglobin level.
So according to me you should take consultation from a doctor then it can be decided what is the exact cause of that body and fatigue.
Next Steps
take consultation from a good doctor to correct a diagnosis and treatment.
Health Tips
you should change your life style as take balanced diet with including take green vegetable and seasonal fruit to increase your hemoglobin level and also do exercise like yoga and meditation.