I'm not a doctor, but based on the provided information, the twitching or convulsing feeling in the area just outside of the right rib below the heart could have various possible causes. It would be best to consult with a healthcare professional for an accurate diagnosis and appropriate testing. However, here are a few possibilities that may be considered:
1. Muscle spasms or twitches: These can occur due to muscle strain, overuse, electrolyte imbalances, or stress. A physical examination and possibly blood tests to check electrolyte levels might be helpful.
2. Gastrointestinal issues: Conditions such as acid reflux, gastritis, or gallbladder problems could cause discomfort in the upper abdomen. Further evaluation may involve tests like an upper endoscopy or abdominal ultrasound.
3. Nerve-related issues: Nerve irritation or compression in the thoracic region could lead to abnormal sensations. A neurological evaluation may be necessary to assess nerve function.
4. Anxiety or stress: Given the patient's mental health issues, anxiety or stress-related symptoms cannot be ruled out. Discussing symptoms with a mental health professional might help determine if psychological factors are contributing to the symptoms.
Again, it is essential for the patient to consult a healthcare professional who can conduct a thorough evaluation, review medical history, and perform necessary tests to provide an accurate diagnosis and appropriate treatment plan.