High blood pressure
has earned its title "the silent killer" for good reasons...sadly.
If you're at all concerned, see your doctor about it. It's better to know for sure than to worry about what you don't know.
As adults, we should have our blood pressure checked at least once a year during our annual medical check-up.
Many pharmacies hire out easy-to-use blood pressure monitors (trust me, anyone can use them when shown how) for resonable hire rates. Those monitors will give you a reasonably accurate pressure reading. Maybe hire one for a week and take your blood pressure morning and night (on the same arm - if you use your other arm to monitor, make a note as it can result in slight variations) - keep track of the times you take it and, if you drink coffee or caffinated drinks, make sure you wait at least two hours before measuring your BP. If you record high blood pressure readings, take your notes to your doctor and discuss it with him or her.
Take care. =)