Yes lavender oil can be beneficial.
In fact it is one we are NOT allowed to use when a women has an epidural because an epidural lowers your blood pressure, this combined with the effects of Lavender can lower your BP too much!
You can burn it, use it in masssage oil...any excuse for a massage is a good one and massage itself can be good for lowering BP . You can also put a few drops in a nicewarm bath.
Cucumber is meant to help...not sure how.
Also eliminate caffiene.
Good luck