i would think in your case a halter monitor would be advise. most of the time after the event has happened all vital signs and heart go back to normal. because it is happening a bit more frequently its time to have all the tests. i have cardiac arrythmias. i go into atrial fib and than v tach and than my heart stops. i have had 3 episodes so far. but after the episode is over all my vital signs are normal. so make sure your pcp just does the tests to clear you. there maybe nothing you can do about it. except be more careful standing up. always sit at the side of your chair or bed a few min's first than stand up. take care i hope they find out what is wrong with you