I take multaq and metoprolol for a-fib that started 4 months ago. I live at 5300 ft. I have been house-sitting at two houses. One week at 6900 feet and one week at 6600 ft. At both houses, i got serious high altitude sickness symptoms-headache, poor sleep, periodic chest pain, at 6900 ft i had serious heart palpitations at night that went away when I drove home/5300 ft in middle of night. Other symptoms are constant and take half or full day to subside after I drive down the mountain. Is this related to a-fib or is it something else? I've been to these houses with no problems for 5 years prior to onset of a-fib. I am female, 64 years, 5'2/150 lbs, decent health except for a-fib and low back pain/disc and SI joint problems. I work full time/desk job-travel