IT IS NOT BEYOND HOPE!!!
What a lousy way to start the day. Did the case fall / get knocked over?
You are describing a pretty common headstock / neck fracture that is usually caused by a sharp blow or other kind of force to a short grain section of the neck. Martin used a nice scarf joint at the nut, where the neck angle changes, in which the piece that would later become the headstock was flipped 180 degrees and reglued along the joint, accomplishing a change in neck angle and at the same time eliminating obvious short (weak) grain. Gibsons don't do this and their necks break more frequently. So it's puzzling.
Sometimes necks break because the case fell over. That can happen just as easily in a hard shell case as not, because the support on the neck is limited to mid-neck and the head stock is out there hanging on its own.
Did the guitar get whacked some time in the last month or so? You might have started a fracture back then, that eventually yielded to string pressure.
Anyway, here is what to do:
1. Lower tension on the strings, but not entirely. Do not disassemble anything and leave the strings on the instrument.
2. Do not pull apart any of the pieces!
3. Look around for any splinters that might have become dislodged and save them in a baggie. Try not to handle them,as oils from your fingers will interfere with eventual gluing.
4. Call a certified Martin tech and get an estimate for repair / restoration. A good tech can piece this puzzle together again and you'll never know it was broken. The strength and sound of the guitar does NOT have to be impaired a bit. You will need to walk the instrument in yourself; I would not leave it at a drop off.
Here's a guy in your neck of the woods. Check references and so forth, as I don't know any more than an internet search told me about the link. Talk to former clients and don't be shy about asking for their experiences.
http://members.aol.com/MandoKinet/MandoKinetics/GMS.html
An option is to contact Frank Ford at
www.frets.com for advice. Good luck nursing your baby back to health.