After my future step son (nearly 30) was kicked out of his father's house, he sent horrible, evil e-mails to his father accusing him of all sorts of things and denegrating the relationship between his father and later A mother. Truly horrible, hurtful things and none of it true. My fiance ultimately cut off all contact with his son.
I'm sorry for what you are going through and hope that things will improve soon. Remember that addiction fueled accusations are typically all used to deflect attention from the addicts use.
Hugs and prayers, HG