had these since in my early twenties,,im now fourty seven,lol, hubby keeps telling me,,you think you,d be used to these by now,,but even though i know what happens i still stop dead till they pass,,wednesday, as i bent to clean the oven,,i had the flutters constant , drove me mad,,soon as i stood up it was better,,some days are worse than others,,if im having a nervy day it makes them much worse ,,on my good days i may just get the odd one or two, i think we make them worse by getting in a state over them