I have the same experience when I come back from a long vacation, and the only thing I find that works is to check my blood pressure a lot--I mean several times a day for a week or more. Doing that seems to remove the scary novelty (basically makes it a bit boring), and after a while, I can actually see that the second reading of the day is lower than the first, the third lower than the second, and so on.
Familiarity breeds boredom, you know.
My BP drops 20-30 mmHg systolic and 10-20 mmHg diastolic from first to fifth measuring. It drops most from first to second. When I'm measuring the blood pressure (usually after a stressful day at work) I think "oh no, it's at least 200 systolic now!!" It's usually 140-150 systolic, and I get somewhat relaxed, next measuring it's 130 and it ends up around 115-120. In the morning it's the same pattern, but it starts at 130 and ends up at 105-110.
I don't think you need to worry :)