I sweated high BP for years. Had the worst case of white coat you ever heard of. I was high normal for years but in the docs office it went way up (along with my pulse etc) My GP finally recommended medication. I went on it and it did bring it down even at home. Got a form online from AOPA, had my GP do a few tests that are normal for an annual checkup, he filled it out prior to my next FAA phyical (you don't have to do anything about it (other than not fly for a short period, I think it was 20 - 30 days) until your next FAA).
FAA doc reviewed the form, thanked me for having the right paperwork and did normal checkup. Sent me on my way with 1st class. Only thing I have to do now is bring an annual letter from GP showing no change
I would visit the AOPA site if you are a member, they have a great section on all this including a list of which BP meds are acceptable to the FAA.
Bottom line, it's no big deal. Better to get on meds and not risk your health, it didn't affect my carreer at all.