Question
I have been having weird vibration/buzzing sensation in body including behind the neck and legs. Few days back some pain started when the vibrations are. Like in the calf muscle and behind the neck.

I do sit on computer for my job for 8 hours for years, but never had problems in past. Got MRIs done and blood work. All is normal. Dont know what else to do. Sometimes I do get tingling in body and numbness or tightness around fingers and face. Taking multiple vitamins but not helping.

Is there something get can cause these symptoms in whole body.

Answer
Without an actual hands on exam, it would be very hard to pinpoint the cause, as many things can cause the symptoms you describe.  Since you have tried the medical route, I would suggest you find a good chiropractor.  They can do an examination and determine whether is is a musculoskeletal problem, or a more severe problem that would warrant a trip to a specialist