Ankle Tendon Injury from Hi-Top Converse

So last April I purchased some hi-top converse, wore them a few times with no issues, then I wore them over a weekend where I went on some pretty long walks. I tied the laces around the top of the trainer, around the area just above the Achilles.

The day after I had inflammation and pain in what I thought was my Achilles, I found it difficult to walk or put weight either foot.

Fast forward to today, a year later, I've been to the doctor who confirmed I had inflammation in my left ankle in particular and gave me anti inflammatory tablets, which helped for the 10 days I was on them. I've been visiting a physiotherapist since November but the stretches/exercises/massages aren't really helping get to a point where it's not painful anymore.

The pain is located just above the heel bone, where my tendons meet my heel. If I go for a longish walk it's quite sore the next morning and difficult to put weight on while walking until I've warmed up the ankle. I find it feel less sore if I rest for a few days/week, but it never gets to the point where it's healed, it just comes back the more walking I do.

It's not super painful at this point, it's just sore every day and it would be nice to be able to walk normally again without limping or feeling pain in the ankles.

Has anyone had a similar experience or does anyone have any advice at this point?