Hello dear, thanks for your question on HCM. In my opinion we should first rule of cardiac cause for your chest pain because you are having following risk factors for cardiac disease. 1. Smoker 2. Intravenous drug abuser So better to get done 1. Ecg 2. 2d echo If both are normal then no need to worry for cardiac cause. Anxiety can be the cause for your chest pain. So better to avoid stress and tension. Be relax and calm. But better to quit smoking and injection as soon as possible. They will only harm you. So stop them immediately.