I had sinus infection and migraine a week back. I used to have heavy lower back pain since a long time but recently my neck has started paining after sitting in office chair. The pain starts in the middle of back and radiates to neck, back of head, shoulder, and sometimes arms. There is a strain like discomfort while bending my neck down to see something and slight throbing sensation in back of head like the base of neck. With random neck turning there is a stinging pain in neck and back of head. I am scared is this muscle strain? It does not happen when I am home only happens during office days. Please help...