ooooooooh...be really careful thinking about this one. Marathons are definitely addictive once you've done the first (esp. if the conditions are against you - tho' can't remember if you said it was windy?) - I completed FLM as my first this year with Mrs S by my side and both of us could not wait to get our trainers back on...having finished walking like Charlie Chaplain, anyway!
However, I look back at my training log which starts the day after FLM - granted I started training for the London Tri, but it goes (numbers are time spent exercising): rest, rest, bike 30 easy, run 30 easy (and I mean real easy), swim 30, rest, row 60, run 55 steady,...and so on.
The run 55 steady nearly did me some serious damage, 8 days after marathon (prior to the marathon taper was doing 50+ miles with 3 x 18+ long runs on the weekends prior to taper, and the 55 steady would have been child's play at that time). Exacerbated by being on roads, both knees and shins complained in a very vocal "you could do yourself real damage" kind of way. Cross trained for 8 days after that, then the treadmill saw some action.
On the day you're hoping to do the marathon-repeat, I managed 60 steady with the notes "tired legs at the end". On that basis my advice is skip it, you have a very respectable marathon time in atrocious conditions - in the circumstances, it should not be seen as a disappointment at all. Marathons are a real test, really tough, and the first is the biggest learning experience - your's just about ten times tougher than hoped!
If you decide to do it, do only one easy run each week of not more than 8 miles. Low impact cross training can fill some other time. No intervals. No tempo. No hills.
However, I'm in the don't do it camp - look at the elite - two per year max. You only have one shot at this running lark with a healthy bod - the type of injury you risk by doing two lots of 26.2 in three weeks is the type that could really stick around. No matter who you are.
Otherwise, good luck. Keep us posted - rest up and stay well.