My bloodpressure is 136/85 after walking a short distance(couch to door) but comes back down if i take it a second time. is this abnormal?

No, Any activity may increase blood pressure. Basal pressure is measured after 15 minutes of being at rest. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.

Blood pressure is supposed to rise when doing exercise. We clinically treat high blood pressure based on elevated readings done at rest. There are 24-hour blood pressure readings, and when they are high most of the day week can consider treating it. Hypertension, like most health conditions, is treated based on the entire picture. Speak to your doctor