My sympathy mate.How sickening for you on a new bike! Having traversed along a number of roads on my a+s due to biking I must say that I can pin point the reasons for every spill I suffered...most of them my own daft fault!
I don't envy you not being able to attribute your fall to anything at the moment.That would really unsettle me.However there have been guys on here who have fallen and in the first days after could not understand why,but later it all came back and they realised what the problem had been.