For me, it usually means one of two things, and correcting them has stopped the noise:
1. I forgot to take my blood pressure meds the night before
2. I take my diuretic (also for high blood pressure) about 3 times a week, and I have let too many days lapse between doses.
But your doctor would have taken your blood pressure at your visit and found then whether or not it was in within normal range. Also I take cholesterol meds. I am not sure if I ever mentioned feeling this to my dr. Has your weight increased, are your pants too tight? Seriously, I read a tight belt can be a (an easily solved) problem. Good luck!