To add to the comment from
@Fairygodmother about adrenaline, I read somewhere that adrenaline is an insulin inhibitor which is one reason why the body releases it as our BG gets low. A healthy pancreas will receive a "message" from the adrenaline to stop producing insulin to allow the BG to rise.
I find it fascinating how the body works ... when it works correctly.
I guess this adrenaline spike will help explain the BP rise.
@bisalimo does the high BP cause you additional problems or was this just a curious observation?
If you have problems with high BP, this should be discussed with your doctor.