Running and Injuries

So Last weekend was my last big weekend before the Marathon. 35km at 4:30min pace on Sat, and stupidly the Sun Run on Sunday. Both runs went well, with finishing the Sun Run in 38min50sec. However I pulled up with a good bout of Achilles Tendonitis on Monday. Thus I am now on physio directions to take it easy until the Marathon in the hope that I will be able to run it. So now I'm onto gym and swimming to fill in the lack of training. Oh well, injuries happen.