Calm down, to a point. Anything other 140/90 is high and puts you at a higher risk of a heart attack. However, my mother is 95, and has been on BP meds for decades!
1) check your BP again right now, make sure you're sitting down, legs uncrossed. Log the date, time, blood pressure, and pulse. If it's gone up or not going down, call and get a doctor's appointment. TELL THEM what's going on.
2) if they don't get you in today, check it again tonight and tomorrow morning, next after activity or anxiety.
3) DRINK WATER, as if you were away a bar, drinking with your friends.
4) IF you aren't going to be seen for a few days, check BP a couple times a day, but do not become obsessed, as it will increase your BP. But log each time. Bring this to doctors.
If you were to call the EMS at 185/96, they would not intervene; that's done at 220.
Is it possible you're diabetic? High cholesterol not under control? If so, tell the front desk. If they can't get you in SOON, go to the ER.