The limit is 155/95. Even if you are over that the doc will wait a little while and take it again. True hypertension will show after a number of retakes. Even after all of that if you actually need meds there are at least 20 different ones you can take and still be good to fly even for a Class 1. You are only "grounded" for 7 days after the start of the new medication. Take a deep breath the doc isn't going to fail you after one high reading.