Clean cannabis is going to lower your overall blood pressure, if it was out of regulation before. Panic attacks can temporarily increase your blood pressure, but that's not from the cannabis. That's your reaction to it mentally.
When my 80yr old father began using cannabis daily, he had to have his high blood pressure prescription strength lowered several times. He would begin having days where he was tired and any small activity really drained him. Checking his blood pressure revealed it was too low. I was planning on having a chat with him in the next few days, to see if he's still on the blood pressure prescription.