I am experiencing stomach cramps, chest wall pain, rapid heart rate (worsened by: psychological stress), dizziness (worsened by: hot weather, lying flat, sitting upright, prolonged standing) and cloudy or blurred vision. The following also describe me:

Don't see a question. here. But I would let your parents know. If you have not had a medical workup for these symptoms would recommend that first. Any medical issues should be addressed and then consider seeing a therapist to help with how you deal with stress. Take care.
These symptoms. could be due to an autonomic dysfunction such as POTS. Have your health care provider evaluate you for autonomic dysfunction or refer you to a specialist who can recommend an appropriate evaluation.