I had no idea that Robitussin could lead to hallucinations. But I am aware that many have used powerful hallucinogens such as Ayahuasca, Ibogaine and psylocibin for similar purposes. Alcoholism is not only riddled with physical components, it has a lot to do with where you are at spiritually. You were drinking alcohol for a reason/cause. It was just a symptom. You have found a way to address the cause of it. In order to sustain this state, you will need to work on yourself a bit and change your perspective on life in general. This is what happened. You were able to see the “light”.