Yes, you can become type 1 after years of being type 2. What this would mean is that you cannot live without taking insulin. It sounds as though you had a C-Peptide test, and discovered that your insulin reserves are low. If you have a practitioner in your area who understands nutritional therapies, this may help preserve and improve what insulin production you have. Eat whole, unrefined, organic foods as much as possible. Stay active, and work on the "tough" one: stress reduction.