I have had this question posed to me many times since I am in Respiratory and typically perform Pulmonary Function Tests on individuals. They have noted great changes in their test results between the cities and the elevation is the key.
So, my trusty pulmonologist gave me some advice:
Drink extra water.
Take an iron supplement.
Take Gingko. It improves circulation so it increases the amount of oxygen delivered to the brain.
Take Diamox (it is commonly used for 'mountain sickness'). You should be able to go to a local clinic and tell them the situation and the doctor or PA/NP should be able to write you a prescription. There are also a couple other drugs like dexamethasone which is a corticosteroid to help with inflammation.
The main problem is the decrease in the oxygen in the air. You have like 18% less oxygen in the air in Denver than at sea level. It is honestly surprising you are still having difficulties with the change in altitude, though. I suggest you visit a doctor. But the Diamox is the most important recommendation I can make. Also, there are some forms of Yoga that can help you adjust. You should also take 10 deep breaths every hour or so. This will open up your lungs and increase the oxygenation in your blood due to the increase in ventilation. I know that sometimes people with lung problems like Asthma and COPD have great difficulty in the transition and that sometimes lung problems won't really show up until the change in elevation is made...
I wish you luck and hope you go to see your doctor.
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