For your acid reflux and pain while swallowing, it's important to understand the role of medications like Zantac and Betahistine. Zantac (ranitidine) was commonly used to reduce stomach acid but has been withdrawn in many countries due to safety concerns. Betahistine, on the other hand, is used for balance disorders and is not effective for acid reflux.

Given your symptoms, you should:

1. Avoid self-medicating with Betahistine as it does not treat acid reflux.
2. Consult your healthcare provider for appropriate diagnosis and treatment options, which may include proton pump inhibitors or other acid-reducing medications.
3. Report your pain while swallowing promptly, as this could indicate esophageal irritation or other complications needing medical evaluation.

Always follow your doctor's advice and avoid using medications not prescribed for your condition to ensure safe and effective treatment.