Walking up small hill and I became very fatigued and dizzy, sat down and broke into severe sweat thought I would pass out. Ate some food and rested and felt a bit better, but worried. I played tennis earlier today with no problem I'm fairly fit and active. However, I do have artheriosclorosis and had a stent in 2009. Symptoms of fatigue on a hill seemed a bit similar to before the stent. On the other hand the air is very bad in the Seattle area now and others are getting dizzy, so it may be just reaction to the air particulates from the smoke from forest fires. I've been a bit dizzy the last few days as has my wife and friends.