Lloyd,
Actually somebody here made a good point. You can get lead poisoning in other ways.
This is very important to realize. Because you cast bullets it's easy to pass this off as the source. But it's dangerous because if it's NOT the source, you aren't taking corrective action in the right place, and you will continue to get lead poisoning.
Think real hard about the fact that you've cast for many years, testing regularly, and never had a problem. You changed nothing about your lead casting habits.
Did you get a piece of fine pottery from Mexico or something like that? Pottery can contain lead glazes. Drinking juice, wine, or coffee from it can leach the lead out.