Good news, try getting some physio felt or thin foam for the heels of your shoes, make sure they are cut to the right shape. Try wearing them for a while to see if you feel a difference walking around, it should take the strain off your tendon and aid recovery. Once your shure the inflamation has gone get some massage on the calves to make sure they are not contributing to the problem. Keep us update will watch on with interest, good luck. A 15 year old girl I coach felt a slight pull on her achilles last night, she had the sense to tell me straight away, stopped the session and administered 20 minutes of ice. Fingers crossed for her as well, not an overtraining issue so right out of the blue.