Based on your average reading you should be just fine. There is a lot of information on line (eg. leftseat.com, Dr. Mercola, youtube) regarding keeping your readings low, especially what to do before your physical (no caffeine etc).
Most AME's don't jump at the first reading as it can be a bit high because of anxiety. The machines also read values that may differ from the AME's as they usually use the manual one.
Make sure you are well rested, and relax for at least 10 mins at the AME office before your reading. Relax your arm and take deep breaths.
If you don't do so, exercise (walk, swim) few times a week.
Avoid medication if you can help it. They usually always have side-effects. But in the end, FAA has lot's of Class I medicals issued with high BP controlled by medicines.