1st time walking = sickness?

Anyone else have a problem when they first started exercising?  I walked a mile today after I ate my yogurt for snack and before I had my lunch (1/2 Wendy's small chili).  When I got back to the office I took one bite of the chili and felt very nauseated.  I am trying to wait but every time I think about getting a bite I really feel like I could be sick.  Anyone else experience this?

HOW FAR ARE YOU OUT FROM SURGERY?

5 weeks - I KNOW, I KNOW, I should have been walking before now!

5 WEEKS OUT IS STILL VERY EARLY OUR BODY'S ARE GOING THROUGH SO MUCH AND OUR ENERGY LEVEL IS STILL NOT AT IT'S GREATEST! TAKE YOUR TIME, THIS IS YOUR JOURNEY IT'S NOT A RACE.