I Have Had Neck Surgery And Back Surgery About A

I have had neck surgery and back surgery about a year ago and I have been having the shakes and my right foot and right arm have been burning and feeling numb my walk is shakey and my lower back and neck is hurting what is the cause of it. the only medication I am taking is venlafaxine ER 37.5 mg . can you tell me if I need to go to the ER room