All of this probably sounds a bit unsympathetic (I can imagine it must be horrible to lose that data, and hope you recover it) but in the further interests of educating so it is less likely to happen in future to you or others:
- It sounds as though you did experience a BSOD (otherwise known as a stop error). Not sure why you say it wasn't one.
- Did you have any kind of backup strategy in place? I imagine not, since you don't mention it, but if you did there may be things you can do to recover stuff. Anything synced to the cloud, for example?