three years of living with a meth head is absolute insanity, no two ways about it. the sudden cessation of that insanity is akin to any type of drug withdrawal......also living with a meth user, who uses IN the home, means you likely had SOME level of second hand contamination.....and possible small amounts of contact high.....thru things that may have had meth on them, thru his sweat, sexual contact. the jury is still out on the effects of second hand contact.
you simply MUST engage in self care. take a shower, HEAT UP some food, start a journal, get outside and take a walk, strongly consider some counseling.