Hello Ashley and thanks for writing in
The cause for tightness on both side of neck can be Cervical spondylosis
but as you have specified Jugular vein
and heart problem, I would like to say that it can be due to valvular disease of the heart. Get your Echocardiography
done and rule out this. As you are healthy, active and no shortness of breath
, I do not think you have any heart issue.
You have some risk factors for Heart disease
like Overweight, Family history and above 35. In my opinion you must get your cardiac check up done to prevent from any further disease.
Hope this will help you.