Part of the problem is the fact that spelling was not standardised until quite recently, and never really has been in Scots.  pitleurachie is "hubbub, confusion" (Alexander Warrack, Scots Dialect Dictionary, 2000); according to the Rev. Walter Gregor (cited in Child's English and Scottish Popular Ballads) it derives, along with lierachie (of which I assume your lammrachie is a variant) from leerach, "the bottom of a dung pit after the dung has been removed, but left in a filthy state.  The word is used to signify anything in a disordered state."

Malcolm