Karen, think about the problem this way. The Achilles tendon is in the rear of the lower leg. Its job is to drop the foot down or what is called plantarflexion. When this tendon becomes irritated there is a loss of range of motion. Now what happens is that the foot no longer comes all the way back up. To accommodate for this the tibialis anterior, the muscle and tendon at the front of the ankle and shin, must work harder to bring the foot up. Also the tibialis anterior is one of the muscles that controls posture by bringing the lower leg over the foot thus maintaining a normal standing posture. This muscle is becoming overtaxed. The result of that is pain, weakness, tenderness, and swelling. These features should show up on an MRI scan but may not be severe enough for the radiologist, podiatrist, and or orthopedist to think that there is a problem. Everyone has a different level of pain tolerance. Yours is most likely lower because of the continuing Achilles problem. I would suggest that you get into a specific strengthening program which should counteract this situation. I will not give specifics as there is no way that I can see the limb involved and how you are moving.