Running on achilles issue

I don't know about the popping sound. My pain was on both sides of the achilles below the ankle bone and near where the calcaneous insertion is. It came on suddenly halfway through an eight mile run. I also had some swelling where the peroneal tendons travel around and below the ankle. I researched tendon therapies and discovered that they do not heal with rest. You have to exercise them and have them rebuild themselves stronger. It's an issue with lack of blood flow in that area. Initially I started with calf raises but it was a waste of time for me because it made my condition worse. Anyway, I would go outside and run 1/4 mile, stretch the soleus (wall push with knees bent) for 1 minute, and then soak my foot for 10 minutes in ice water (small waste basket like the ones in a classroom worked for me). At least four other times a day I would do the same but I'd substitute the run for a brisk walk for 1/4 mile on the treadmill. It was painful stretching but I stretched every chance I could (more than 8 times a day... soleus). After a week running 1/4 mile a day I upped the mileage and the pain slowly went away. I do believe that a massage after my icing sessions with 1percent hydrocortisone really helped as well. Why don't you report back your progress?

Good luck.