Chest pain can have various causes, even if initial reports appear normal. Potential reasons include:
Musculoskeletal Issues: Strained muscles or costochondritis may cause chest discomfort.
Gastrointestinal Conditions: Acid reflux or gastritis may mimic cardiac pain.
Psychological Factors: Stress and anxiety can contribute to chest pain.
Respiratory Issues:Conditions like pleurisy or inflammation of lung lining.
Nerve Irritation:Conditions affecting nerves in the chest may cause pain.
If chest pain persists or worsens, consult with a cardiologist for a thorough evaluation to rule out serious conditions.

Since all your reports are within normal limits, especially angiogram which is a gold standard to evaluate cardiac pathology. And as the Gastroenterologist has given you a clean chit, therefore we assume that the cause is anxiety and improper lifestyle. You need to you have a healthy lifestyle. Regular and enough sleep is must and gadget exposure has to be minimized. Regular exercises and yoga to calm your mind will be of great help. Hope our answer helps you. Our page might help you out - Gastroenterologists in India.