Meds, diet change and exercise. That is deadly dangerous hi. My doc freaked when my bottom number got up to 100. You are a heart attack waiting to happen. You seriously need to be on BP meds before you stroke out or your heart blows.
If your BP is 158/135 that is seriously high. I hope you are under a doctor's care. The top number is the pressure to push the blood from the heart to the rest of the body. The bottom number is when the heart is at rest. That number should be in the 70 to 80 range. Your heart is working overtime to keep you alive. You need special medicines and a very strict diet. Please get to a doctor ASAP. Good luck.