Hi there ~
I understand your concerns. If you are having chest pains and feeling of something in your veins and shortness of breath
I recommend that you consult a doctor immediately. In view of your drug dependence
, it could be that you are having a severe cardiopulmonary disease
which can be life threatening and you most likely have pulmonary embolism
which is also fatal. I believe your consultation with a psychiatrist
should also trigger a cardiology/internal medicine consult that would take a look at your medical problems. I hope you get on the path to recovery as soon as you can.
I hope this helps. Take care of yourself and have a lovely day!