I am in a similar position. What I have been doing is maintaining the milage but ditching tempo runs and speedwork runs. You could try that.I've currently been training for the Robin hood half marathon for 2 months now. I've been averaging around 35 miles a week, with interval and fartlek training as well. My fitness at the minute is the best it's ever been. With the half marathon on sunday i want a little deserved rest after. I also don't want to loose all the hard effort that i've put in over the last 2 months.