Im not sure as a type 2 that going back on insulin is all that good a choice. There are many drugs available as Sharer pointed out. Look at the thread in this forum for drugs available to Type 2 people. You'll see all the stuff you can add to metformin. I take metformin, avandia, glipizide and Byetta.
In any event, let your Endo guy know whats happening with his blood sugar and go from there.