Is it because of B12 deficiency. True?

Please get the injections done under supervision of a qualified doctor. Yes they do cause reactions rarely

That is correct. Reactions do happen sometimes, although they are very rare, the injections should always be given under controlled circumstances by a qualified professional who can identify the symptoms of such reactions.

This treatment is being suggested on bases of the information provided. I would like to examine & investigate you in detail. Rule out Hypertension, Diabetes or any other metabolic disorder. Any way it may be tried, --. Dolokind Plus (Mankind) [Aceclofenac100 mg +Paracetamol 350 mg] 1 tab. OD & SOS. X 5 days. --. Caldikind plus  (Mankind) 1 tab OD x 10 days. (You may need help of your local doctor to get these medicines.) --. Fomentation with warm water. Let the part not be exposed to cold. --. Sleep on a hard bed with soft bedding. --. Use no pillow under the head. --. Avoid painful acts & activities. -- .Do mild exercises. --.(Take help of a physiotherapist). --Do not ignore, let it not become beginning of a major problem. --Do ask for a detailed treatment plan. Kindly make sure, there is no allergy to any of these medicines. --For emergency treatment Contact your family doctor or visit nearest hospital. --Wish you a quick recovery & good health. --I hope, I have solved your problem to your satisfaction.   --Kindly rate the answer. Dr N C Gupta MS (ortho).