Absolutely, yes, talk to a lawyer. You are more than likely entitled to a good-sized portion of the house, a portion of his retirement plan, a portion of anything else you own acquired during marriage, not to mention child support and very likely alimony. This was a long marriage, and there is no reason you and the kids should have to live on a shoestring while he goes his merry way.
Many lawyers will give you a free consult. You don't have to decide anything permanent immediately, but at the very least your children have the RIGHT to financial support from their father.