You are not going to like this. I had achilles problems 3 weeks before the London Marathon in 2005 and decided to run it - big mistake. I have spent £100s on physio, pediatrists etc - 7 years on I still cannot run 1 mile without pain. Good luck with your decision.
Been there and got the tee shirt. Not run more than 5 miles since London Marathon 2005. Tried lots of Physio,- 2 years ago I had a Consultant look at it. I was told I had torn tendons off heel - they cannot re-attach without growing bone. I now have a large bone growth which is seriously sore. Xrays and scans, + steroid injuectons - no improvements - achilles feels as if it needs stretching 24/7 - no stretching works
I started using muscle rubs 6 months ago (theory being to improve blood flow to injured area). During the day I use the rub and wrap the heel in cling film!!!!. At night, just the rub to allow the foot to breath. RESULT
Tendon is no longer tight, I am running 5-6 miles (although after it still needs serious icing. Cannot run on consecutive days but aleast I am running. Sounds daft but it worked for me. Poundland has cheap muscle rubs that seen to work.
Seeing a pediatrist this week for gait analysis with a view to custom orthotics. - I will keep you posted.
Wish you luck,, but you may need to revise your training for long miles
Not the advise that you probalbly want to here but I ran my last London in 2005 (7 previous). 3 weeks befor I developed a heel problem on a 20 mile run. Kept topping up with Iboprofen to mask the pain and and did the marathon. 5 years later and i am still having trouble - cant run more than 5 mile - have to ice after. - Should I have run on it - NO. Would I have run it had I have known - YES. Because of all the hard I put in and because I am (was) a runner. My advise - you have probably done enough miles to get you through (you should be tapering now). Take it easy - DONT pop the pills - forget about targets, just enjoy the day - these nothing like it.