Hi there ~
I understand your concerns. The common symptoms that you describe of chest and left arm and leg hurting, heart palpitations, throbbing in the head are all from using weed in the smoked form and probably laced with other substances as well. I suggest that you stop using the substance immediately as your description of the pulling in your head sounds to me like you are having problems with auditory hallucinations
as well. Please consult an ER doctor as soon as possible or call and set up and earliest appointment with your doctor.
I hope this helps. Take care and have a lovely day!