Does anyone else get ill when returning to sea level from high altitude? I am lucky in that I aclimate quickly to altitudes of 10,00-14,000 feet but after every long trip, I am sick a day when I return to home at sea level. Plugged sinuses, headache. I am usually well rested and feeling great when I leave the trailhead and by the time I get home, ugh! I have tired not drinking beer or wine the day I return, staying on backpack food for a day - nothing seems to work. I fear it is the horrible air pollution down here in the lowlands. I am allergic to my home!