My Achilles tendon started bothering me last week too. I was out for a walk, about 1-3/4 miles in and my ankle started hurting, then the tendon. I had to limp back to the car.
Last Friday, I went out for another walk, 2-1/2 miles and it was fine. Tried again Monday and less than a mile in, it started hurting again. It didn't bother me at all when I played golf on Wednesday (with a cart).