hi. I have had a light aching throbbing in my neck , left side, for a couple of days now. I feel the throbbing with my heart beats, which makes sense, but I also an ache on my chest on the outside of my least breast . I am a smoker, never more than 15 per day, and some days only 3 or 4, so I am concerned about clots. I am 41 years old. I am sure there is no easy answer, but I thought i d give this a try