So this morning my dog went into my closet and ate some insulation.. im not sure if he swallowed it but it was all over my floor... could he die?

It might cause him internal distress. Is he still eating and drinking water normally? If not, then suggest you call the vet and take him in as soon as possible. He might have eaten too much and it could cause an obstruction and possibly kill him if not treated.

My sister brought food home and I gave him a little he eats it... so that s not a problem he is eating... but my moms at work I have no way to the vet