I too am dealing with achilles peritendinitis (self diagnosis at this juncture) and waiting to see a sports/ortho dude next monday. I've been off the bike all together for 1 1/2 weeks and it is driving me crazy, but I want to get this sorted out and rehabed properly, lest I cause a chronic condition.
Just a FWIW, a couple other associated conditions with achilles tendinitis are familial hypercholesterolemia and rheumatic conditions- both of which both or either of my parents had/have.
Good luck Bill