Hi.
Firstly, good luck with the run.
Secondly, although I am not following the schedule you mention I am in very similar circumstances. I have been struggling with training simply due to my work shcedules being all over the place and not having a running partner. It is not advisable for a young lone female runner to go pounding the streets after dark. So my training has been highly depleted. I have received lots of "advice" from friends, relatives who are not runners, which kind of winds me up, but what can you do?? The only other thing worrying me, is will I make my sponsorship amount??
But onto the positives!! At the end of the day, as long as you finish, raise money for charity, if applicable, and enjoy yourself, that is all that matters. It is alright for people to crab those who run or walk a marathon, but these people cannot accept that all are individuals, not machines.
Plus, do you know what is round the next corner??
I have run three mini London Marathons, three Great North Runs, one London Half Marathon, three Flora Light Challenges, a few local races, one London Marathon and I WILL COMPLETE my second in four weeks time. And I am just 20 years old. And that is why I do it, you honestly do not know what is round the next corner, you must do these things whilst you can. Not meaning to show off or write an essay here, but hope this spurs you on. Good luck on the day!!