I'm 57yo Female. We Recently Moved And I Noticed Upon

I'm 57yo female. We recently moved and I noticed upon exertion lifting boxes I would sweat profusely and was out of breath going up and down stairs. Up til then I was not sleeping well and anxious about the move. I'm overweight and had been riding my stationary bike foe 20 minutes a day before the move. Also on moving day the bottoms of my feet hurt. I have been extremely tired since we moved a week ago. Could this be lack of iron? Or dehydration?