One option that worked for me was acupuncture.
I had achilles problems for several years from my mid-twenties following a kick in a game of football.
It stopped me playing and running.
After having, over several years, physio, rest, stretches, podiatry, anti-inflammatories, light-touch therapy I eventually tried acupuncture.
After the first visit my swollen achilles shrank in size to match that of the "normal" one and I can play 5- a-side again. Eleven-a-side is beyond me but, that's down to age.
Good luck.