it’s a total ballache.
Mine came on – both ankles – within a month of one another. I tried all sorts of things. Phyisio, rest, night splints to stretch it out when in bed (the most uncomortable thing EVER).
I ended up seeing a podiastrist who analysed my running technique and provided me with some orthotics to put in my running trainers. It just raises the heel slightly so as not to over pressurise it.
Additionally, I have embarked on a more rigorous stretching regime. Back, hamstrrings, calves as well as ankles themselves.
All in all….it’s taken me about 18 months but is much improved.
Cycling seems to shorten everything and therefore irritate indirectly the tendonitis…