Hello,
Welcome to ehealthforum
The BP reported by you is very alarming as 170 and greater can cause various issues as stroke,heart problems and other systemic involvement.You need to rush to ER and first of all get the BP lowered by means of medication.
Also various investigations would be required to check if there is any heart issue.Kindly visit to Emergency without wasting time and also consider taking someone along with you and avoid driving.
Take care!