Called writers cramp. Adequate hydration, meet a nearby physician

Some examination test required to confirm diagnosis

Yes, it is possible that your hand pain and headache are related. When you write for an extended period of time, you may be putting excessive strain on the muscles in your hand, wrist, arm, and shoulder, which can cause pain and discomfort. This can sometimes lead to tension headaches or migraines, especially if you are already prone to them. It is important to take frequent breaks when writing to rest your hand and avoid putting too much strain on your muscles. You may also want to try using ergonomic writing tools or adjusting your posture to reduce the strain on your body. If the pain and headaches persist or worsen, it is recommended to consult a doctor for further evaluation and treatment.