time to train??

was running well up until july when i had a bad fall on my horse and had a month off due to a bad back, starting running again in august and pulled a muscle in my neck on hols!! now due to a bad bout of flu followed by a sinus infection( i know i sound like an old crock, but i'm hardly ever ill, but when i am, i really am if you know what i mean)i havent run since august, however i am possibly going to start again after the weekend as i'm feeling a little better, would i still realistically be able to put in the training needed for the flm, i dont want to do it if it means taking the place of someone who has put the training in.