As much as you can you should try to train in a fasted state and race in fully fueled. Training depleted will accelerate the fat adaptation process. From the sounds of it you have not maxed out your own personal fat adaptation. I would not expect to see maximal fat adaptation from fasted runs occurring in just 2 months. A time line for many months to years is more likely to show big gains. This doesn’t mean you should drag you sorry ass through long runs with that queasiness. So carry some food for those times when the glycogen tank goes dry. But give this process time to have the effect on your metabolism. In the mean time carry food but try to use it sparingly in times of need rather than preventively.