SJA ... excellent chart!
BP is can never lead to a diagnosis on its own, you'll need a plethora of additional tests to determine a root cause. With a documented history of elevated BP, I'm sure the medical community will be happy to start you of meds. Be suspicious if they want to start you on the newest fangled drugs, you're being used as a guinea pig for big pharma! The old advise of cutting salt, carbs, diet control, ect isn't always right; it depends on what is causing the higher BP. The first thing they would do/did (before the shortages of saline) was hook you up to at least one bag of saltwater when you came in the ER, ever wonder why, if salt was so bad for ya. Your GP can order the initial test, but find a 'old school' cardiologist. Tech knowledge and new procedures are great, but experience will always trump the new ... you can fill in the blank. Avoid statines, there are alternatives.
If you're looking to immediately lower your BP, deep breathing will often accomplish that for you ... Breath in thru your nose for a count of four, hold for a count of four, and completely exhale thru your nose for an additional count of four; repeat for ~ 2-5 minutes. You might want to do this sitting or laying down.
Other tidbits of useful info -
Never take your BP in the same arm in rapid succession. The cuff construction can alter the readings if not followed with enough time to return to stability.
BP differential can provide casual information between arms too. One arm/thigh always higher than the other?
Are you using the correct size cuff when taking your BP, it does make a difference.
Take your BP cuff with you to your doctor's appointment so it's accuracy can be checked ... It's amazing how far the automated cuffs can be off.
Never cross your feet/legs before taking a BP, it will result in a higher reading.
With the heat across the nation, are you dehydrated ... affects BP also.
And refrain from taking BP at least 30 minutes following exertion, it will alter BP in either direction depending on the amount and your body's tolerance.