Presently on 20mg of Lisinopril. Altitude intolerance @4500 ft at...

Presently on 20mg of Lisinopril. Altitude intolerance @4500 ft at Yosemite yesterday caused me to call 911 on one of the hiking paths. My blood pressue dropped to 112/60 and the side effects were severe. My hiking partner was not sure if the paramedic was joking or not when he said he could not find a pulse on me, but after 2 saline iv's I came back to life after nearly going into shock from a LOW blood pressure episode . I never want to be that sick again. I was rushed to the local clinic and diagnosed with altitude intolerance and the doc said I may need to lower my lisinopril (20 Mg) dosage, because it may well be the source of my intorerance episode. I went X- country skiing earlier this spring and had a similar experience, but not nearly as life threatning as yesterdays ambulance ride. If anyone is thinking of driving to a higher altitude, don't exert yourself immediately. If it is an extended stay, take it easy and let your blood and body acclimate to the thinner air. I will ask my doctor to lower my meds to 10 mg because I now regulary jog 3.5 miles a day to keeps the pounds in check and I FEEL so much better.