Hello, Thanks for your query on HCM As per clinical history is concerned follow like this - 1)Do a detailed clinical examination and as per your description it is good and do a blood test to check blood level of carbon monoxide level. 2)Discuss with your Doctor about oxygen therapy and hyperbaric oxygen therapy. Do follow lifestyle modifications like this - 1)Install carbon monoxide detectors. Put one in the hallway near each sleeping area in your house. 2)Open the garage door before starting your car. Never leave your car running in your garage. Be particularly cautious if you have an attached garage. Leaving your car running in a space attached to the rest of your house is never safe, even with the garage door open. 3)Use gas appliances as recommended. Never use a gas stove or oven to heat your home. Use portable gas camp stoves outdoors only. Use fuel-burning space heaters only when someone is awake to monitor them and doors or windows are open to provide fresh air. Don t run a generator in an enclosed space, such as the basement or garage. 4)Keep your fuel-burning appliances and engines properly vented. 5)If you have a fireplace, keep it in good repair. Clean your fireplace chimney and flue every year. 6)Keep vents and chimneys unblocked during remodeling. Check that they aren t covered by tarps or debris. 7)Do repairs before returning to the site of an incident. If carbon monoxide poisoning has occurred in your home, it s critical to find and repair the source of the carbon monoxide before you stay there again. Your local fire department or utility company may be able to help. Hope that helps