My worst case of achilles tendinitis I did not stop running, due to a running streak of twelve and a half years and counting.
The following are a few things to add to what has already been said.......
1. Submerging your achilles in a bucket of ice with cold water added, seemed to be the most effective way of icing achilles.
2. Laser- Didn't do squat.
3. Ultrasound with a cortisone cream - May have helped a little.
4. Advil - Always a standby, but didn't do anything to help it heal.
5. The thing I would have to say that really helped to bring my achilles around was accupuncture. Let me say I was a total sceptic about having it done, but I was at the point I would try anything. My physio suggested it early, but I thought he was crazy. I finally tried it after about 3 weeks of him pressuring me. The next day it seemed a little better. Had another treatment. Following day it was noticeably better. Continued treatments for 2-3x per week for 3 weeks. Was able to started doing light track workouts again 1 week after the initial treatment. Felt a little stiffness, but nothing too bad. You might say that time was part of the healing in my case, but it just seemed to be too much of a coincidence that it improved so quickly with no other variable.
A few other things to keep in mind......
~ Stay off the uphills.
~ Stay off the soft surfaces.
~ Make sure your shoes are in good shape and that you are wearing the proper shoe for your foot type.
~ Heel pads may help.
~ Running on a slight downhill grade on a treadmill seemed to be a little easier too.
Best of Luck,
Old Streaker