For your acid reflux and pain while swallowing, it's important to understand that Zantac, which contains ranitidine, was commonly used to reduce stomach acid but has been withdrawn in many countries due to safety concerns. The medication you mentioned, BETAHISTINE-16MG, is not related to acid reflux treatment; betahistine is typically used for vertigo and balance disorders.

Key points to consider:

1. Consult your doctor: Pain while swallowing can indicate esophageal irritation or other complications that need proper evaluation.

2. Appropriate medications: Acid reflux is usually treated with proton pump inhibitors (PPIs) or H2 blockers approved and safe for use.

3. Avoid self-medicating: Using medications not intended for acid reflux can be ineffective or harmful.

Please reach out to your healthcare provider to discuss your symptoms and get the right treatment tailored for you. If pain while swallowing is severe or worsening, seek medical attention promptly.