I have awful heel pain which has lasted at least a cople of months and put me off the bike and generally saddened my demeanor!
Its both achilles tendon and plantar faschia. Each time I get some improvement/rest it seems to then tear and go back to being sh*t next time I spend any serious time on my feet. I hear it can take a long time to get over.
I was doing exercises, and am resting/icing and heating as much as I can, I plan to start the exercises up again. Gentle riding doesn’t seem to hurt it.
I have this advice sheet which was highly recommended:
https://www.dropbox.com/s/sxjlnfaqd79voix/HO2-Feb-2004-with-exercise-sheet%20%281%29.pdf?dl=0