I am 70 years old and played tennis for 50+ years. After playing one day my achillies tendon was quite sore. I babbied it for a few days and it felt good. I played yesterday and it was fine. I iced it and as the day wore on it got more and more sore. In the morning it was still sore,so I put a heating pad on it for a couple hours. Its little better.Any idea whats going on here? The sore area is about 2 to 3 inches above the floor and is not red or swollen, but is sore to the touch.