A persistent, one-sided headache at the back of your head could indicate a tension headache, migraine, or nerve irritation. Relying daily on Saridon and Otrivin can actually cause "rebound headaches" and worsen your symptoms. Please stop using Otrivin if you have used it for more than 5 days. For temporary relief, you may try an anti-inflammatory medication like Ibuprofen (400 mg) after food instead of Saridon. However, because your pain is severe and recurring, please consult a doctor for a proper diagnosis and tailored prescription. Avoid further self-medication.

Saridon contains caffeine and a pain reliever that can irritate your stomach lining and increase acid production, causing pain. To relieve this, you can take an over-the-counter antacid (like Gelusil or Digene) or an acid reducer (like Omeprazole or Famotidine). Avoid taking any other pain relievers, as they can worsen the irritation. Sipping warm water can also help soothe your stomach. In the future, always take Saridon with food to prevent this. If the pain is severe, persistent, or accompanied by vomiting, please consult a doctor immediately.