Same thing happened to me, but not with music. I used to love to paint. Even painted with a professional artist for 5 years then just lost my desire. I dont know why, just no longer inspired. Now I just walk past all my paint supplies and think what a waste of time. I definitely think its chemical, but I havnt been able to get myself back into it. And I was good, you know. Its harder for you, because it sounds to me like you are trying to make a career of it? I wish you the best. We need good musicians. I hope you dont quit. Look at history, some of our best artists had some sort of mental problem. Imagine what a loss it would have been if they hadnt endured to the end. Just a thought.