All the above answers are good; but you are wanting to know what you can do to lower it RIGHT THEN.... An true example of the breathing exercise
my doctor gave me to do:
I went in to the cardiologists' office for a chemically-induced stress
test; but BEFORE the test, when they took my blood pressure...it was SKY-HIGH due to FEAR. ( Ah,...yessss, when my heart stopped the last time we did this test...you betcha I was scared ! ) They were going to cancel the test...until I told him.." Go away & give me 10 minutes."
1. Breath in thru your nose for a count of 4.
2. HOLD your breath for a count of 4.
3. Then slowly blow out that breath thru your MOUTH for a count of 7.
Repeat until the B/p comes down.
When the dr came back in 10 min. my B/P was lower then his ! And the test was a breeze !