This injury is one of the most bizarre - I have nothing to show outside my skin and my wife for years thought I was just making it up because she couldn't "see" the injury. I'd never heard of it before, just woke up one day having trouble with one of my legs working correctly and being very painful in the mornings or after standing/sitting/walking/running for too long.
I've been dealing with it since 2010. It got so bad in my left leg that I could barely walk without hobbling around - I had been trying to run more and just work through it and I didn't know that running/walking/stairs was actually causing more problems with it. Eventually the problem spread to the other leg as well.
In 2011 I went on a military deployment, and right before I was told by an physical therapist that it would need about 9 months of therapy to fix. I didn't have time for that, and didn't start getting treatment until I transferred in 2012. The physical therapy was great, and she knew where every knot was in the tendon. Though I didn't stretch on my own as much as I should have, it restored flexibility and enabled me to walk and run (somewhat) without pain I had before. I highly recommend if you can get PT to look for someone that does dry needling. Unfortunately I only had a referral for PT for about 3 months, and without me doing the at-home stretches the problem has started returning. I saw a PT at the same clinic in 2015 but a different PT who wasn't qualified to do dry needling - and because of that it required more painful pressure/massaging techniques, and I really didn't feel like it was helping. Combined with several life changes during that time and my not doing the stretches, I wasn't helping it either. I want to get another referral and go back to get the needling, and do the stretches they recommend as I really want this to go away so I can run again.
TL;DR, sorry for all that back story but it's nice to share with someone who understands all of that. The PT I was seeing recommended better insole support in all of my shoes/boots and frowned upon the Dr. Scholls ones I had purchased. I still kept the old ones, but I think if I had followed through with stretching more often (and got help earlier) it would have lessened the amount of pain (and needed therapy) I'm going through.