i have a big knot in the left side of my neck and sometimes experience shoulder, chest, back and side pain and arm pain, and sometimes numbness in my hand and arm, usually either the pinky on my left hand or the thumb on my left hand is . what could be causing this? i have an appt in a little over a week for a ct scan, but sometimes it scares me and not sure if i should go to the er or just wait till after my ct scan is done. Just wondering if the knot in my neck and the numbness and pain are related and what could it be?