Heather Waldron and John Hawley are losing their four-bedroom house in the hills above Blacksburg, Va. A teenage daughter, one of their five children, sold her clothes for spending money. They worried about paying the electric bill. Financial disaster, they say, contributed to their divorce, finalized in April. Their money problems began when the University of Virginia Health System pursued the couple with a lawsuit and a lien on their home to recoup $164,000 in charges for Waldron’s emergency surgery in 2017.