I'm sure that most everyone gets the 'training blues' from time-to-time, I know I did.
But in all honesty, nobody can do it but you.
To get over my blues I booked every weekend for 8 weeks in advance, knowing that something like the weather would intervene. In the end I would fly about half of the time I booked, but progress was being made.
Time to make a plan and then stick with it as much as possible. By the sound of it you're over half-way through the course, it would be a shame to stop now.