Hello, You are suffering from headache, dizziness, chest pressure. You also have seasonal allergy for which you have been taking DayQuil and other medicines. Such symptoms are commonly due to dehydration, stress, exhaustion, hypoglycemia, low blood pressure, etc. You are suggested not to skip meals, take adequate amount of water and beverage to help normalize the sodium-potassium depletion and normalize the blood sugar level also. Stay at rest, it will help reduce your symptoms. Avoid exposure to sunlight. Take antacids or PPIs, one SOS when required. It will give much relief. You can continue to take PPIs, one daily for 5-7 days. Avoid getting constipated. Take laxatives if needed for better bowel movement. Avoid sedentary lifestyle. Stay active. Side effects of DayQuil that you have been taking causes dark urine, less appetite than normal, yellowing of your skin or the whites of your eyes, upset stomach or pain in your abdomen, etc. You should stop taking DayQuil as it may cause liver damage. You are suggested to take liver tonics to help repair your liver. Take plenty of water to detox liver, take boiled food over fried food till your urine gets clear. You can get clinically examined by a GP , get all required tests (LFT, stress tests, etc.) and imaging tests done. You will be accordingly treated. Stay away from addictions if any. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician