Running On Empty...

Last time I was on here I wrote about running on the treadmill but now all I feel I can write about with any expertise is running on empty.
I am exhausted, I've never felt so tired, not in a I can't get enough sleep way and not in a I'm tired of life and want to give up way but somewehere yo-yoing between the two.
I feel chronic guilt if I'm not doing as much as I can/should/need to and sheer exasperation when I do as much as I can/should/need to and feel like I fail at it.
I know what you're thinking - take a break, chill out etc etc but I'm in the last 7 months of a 24 month MA course, taking a rest now would be like the hare that has a nap and gets overtaken by the tortoise.
The dilemma is not whether or not to work hard, it is simply what to work hard on.
I joked with my housemate that if I had put as much time and effort into my lovelife as I have changing careers I'd be turning them away in their droves at the door (which would be nice)!
But I haven't because all I have wanted to do for the last two years is open doors to a different future for myself and now I feel like all I ever do is run between the doors that might open frantically trying the handle instead of choosing one and preparing to step through it with both feet.
For anyone who's hesitated when choosing which carriage to get on in the tube and watched the train pull away might know what I mean.

I have got into a terrible habit recently of quizzing friends about certain aspects of their lives - travels, purchases, jobs, affairs - if I think it might make an interesting aspect of a future play and I keep saying "it's all material".
Most of them are supportive and quite flattered but a few of them seem to wonder when these stories are going to materialise.
They're not the only one, I feel like I need to stop collecting material and start telling the story.
And if I could just figure out which story that is that would be a good start...