I'm really worried about this situation where someone feels tired and uneasy in their chest after walking a short distance. Even though all the medical tests like the blood sugar, ECG, and X-ray came back normal, they still need to rest before they can keep going. What could be causing this, and what should we do next?

It sounds like your symptoms could be related to angina, which is chest pain or discomfort that occurs when the heart muscle doesn't get enough oxygen-rich blood. Since your check-up results were normal, it's important to continue monitoring your symptoms and follow up with your doctor if they persist or worsen. In the meantime, you can try taking a medication like **Aspirin** 75mg once daily to help improve blood flow to the heart and reduce the risk of blood clots. Additionally, **Nitroglycerin** sublingual tablets can be taken as needed for chest pain relief (0.4mg every 5 minutes, up to 3 doses). Remember to always carry your nitroglycerin with you in case of emergency. If your symptoms continue, further evaluation by a cardiologist may be necessary.