Ok. Warning: this is going to be long-winded. No advice, but tons of empathy.
June 2005 I went from 40 miles a week (very slow!! - I'm not a training forum person!!) to absolute zero through injury.
Tried to get back after eight months, no go. Several false starts after that until June 2006. yes, a whole year!!
Fully accepted it would be back to square one, and for two days did the walk/shuffle that I'd started at three years previously. But it actually only took about five trips before I ran for 20 minutes, and then 30. So - far from being back to square one (zippy, young or otherwise Good Runners please move along to next thread) ;o) I pootled along happily for several weeks, just enjoying being out there again. I didn't even wear a watch, let alone a HRM.
BUT.
Life, injury recurrence and other stuff have got in the way of my returning to the 5-6 days per week I used to do. It's been sporadic, something that wouldn't actually worry me if I hadn't signed up for [glares at Candy Ollier] the New Forest Half, which is on Sunday. In the past four weeks I have run three times. Then I - VERY rarely for me - got sick last week and I've only just had my first full day's nutrition.
I have come sooooooo close to cancelling Sunday, but you know what? It may take me three hours (truly!) but I actually don't mind too much. I mind, yes, but not tooooo much.
It's just a training run for Grim.
;o)