The reason you feel phony writing sober is because you feel like the drunk you is the real you. It's not. But it is understandable that you'd feel that way. Treat it as an experiment. Although sobriety felt quite unnatural for me for some time I decided to stick at it to see what happened. I found that a lot of the qualities which I gave alcohol the credit for were actually just me. Just because you feel like drinking gives you your creativity doesn't make it so, you just haven't done it sober yet. Give it time x