HARRY - I HAVE NOT PERSONALLY EXPERIENCED THE SYMPTOMS YOU DESCRIBE, HOWEVER ALTITUDE SICKNESS USUALLY PRODUCES OTHER SYMPTOMS: AT ABOUT 7,000' SYMPTOMS ARE HEADACHE, FATIGUE, SHORTNESS OF BREATH, NAUSEA AND POOR APPETITE. SLEEPLESSNESS IS COMMON ALSO. SYMPTOMS USUALLY IMPROVE AFTER SEVERAL DAYS AT ALTITUDE. THESE SEEM CONTRARY TO YOUR SITUATION. STEPHAN [log in to unmask]