“Fainting or lightheaded feeling?”

I am 63 and have been treated for high blood pressure. I have taken Ramipril 10mg capsules for 4 years and Amlodipine 5mg for the past 2 years. Last week I was walking and suddenly felt lightheaded and fainted I came round pretty quickly on the floor I landed on the grass so I had no damage physically. I had no pain or headache-no breathlessness I checked my bp 20 minutes later when I got back home it was 113/63. I have had more exercise recently because of lockdown I just wondered if my blood pressure was too low because of the walking.