Hi. I ve gone through your query and I can understand your anxiety. Vicoden has a combination of hydrocodone & acetaminophen, which helps to relieve pain & to reduce fever. It presents with common side effects like Nausea, vomiting, constipation, lightheadedness, dizziness etc. It might cause or worsen the headache at times. As you already have uncontrolled headache & if any of the above side effects is noted in future its better to quit vicoden & switch over other OTC drugs. Hope I have answered your query. Let me know if I can assist you further. Take care. Regards, Dr. Yogapriya V, General and family physician.