So sorry to hear that Mark but you are doing the right thing, well the only thing, by resting. Plenty have been forced to stop due to injury but come back and carry on so no reason why you wont either. Swimming is and ideal way to keep fit and cross train in the meantime!
Sorry to hear that Mark. I too am out of the game-3 weeks last Wednesday. i was tackling the stamina pod and right at the end got rushed by a dog coming towards me. So, what did i do? I avoided the pesky thing! In doing so i wrenched my knee. Went to my osteopath on Tuesday, as my back playing up too (the posture in the way I was walking affecting it), and I've torn the ligament. He gave it a good going over (ouch!), and my husband has to be a bit of a masochist and continue the treatment. it is working, but think I'll be out for another few weeks until fully recovered. If you ever get a knee problem retro walking helps apparently, as it strengthens the muscles supporting the joint, so will try some of that once less painful.
I feel your pain, Mark - not literally as mine is in my thigh. not my foot - but I too am out of action as I mention here: couchto5k.healthunlocked.co...
I know what you mean about being particularly down about an injury when you feel you've reached a good level so fitness.
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Where 2 years running has got me!
New year, new me!
Who is running New Year's Eve or busy making New Year's resolutions?
New years day run here goes! 
1st run of the New Year, encouragement for the Newbies
