Ryan Jaidsedha Burton:
I hope that there is more sense of what can be made of this totally life altering experience.
..Then duality totally vanished and my awareness merged with an ocean of infinite and boundless light. There was bliss and peace beyond measure. It was the bliss of being everything that has or will ever exist, while simultaneously being nothing at all. This ocean of pure light was brighter than an entire universe full of suns. In such an experience time and subjectivity ceased to exist. There was simply eternity beyond form and thought.
Yes, this bolded section sounds like you experienced a glimpse of enlightenment, it describes it very well. I have heard the quote; "My mind tells me I am nothing, my heart tells me I am everything". The direct experience of this is the bliss of enlightenment.
I had a somewhat similar experience in high school, before I started on a spiritual path. Not on drugs, just everyday life, I experienced being fully in the present moment without separation for a few seconds. This experienced caused me to begin meditating later, and was responsible for my quick progression on the path.
I believe having an experience such as this is extremely valuable because; 1. Now you know definitively that enlightenment exists, having experienced the state of non-duality, and 2. If you search for it now, i.e. begin on a spiritual path, you know what the true, or ultimate goal is, so you will not stop until you reach that goal, you will not be satisfied with lesser states.
One thing I would say is trust in that experience, trust in its validity, and trust that it can be experienced in your life (naturally). To become enlightened, or even to make progress on the path requires an enormous amount of effort. The reason we put effort into things is because we want to get something out of them. What you can hope to get from the spiritual path is enlightenment. Thus, if you proceed with this experience as your ultimate goal, then you are proceeding correctly, you are heading in the right direction.
The spiritual path is a long one, and there are many steps before complete enlightenment, and the attainment of experience as you have described. If you have correct motivation, you are on the right track, and you can achieve the ultimate goal.
Note, I am saying this as someone who has traveled the full path and reached the enlightenment. There seems to be a lot of doubt on here as to that, but please take my advice not on the basis of whether or not I'm enlightened, but whether or not this advice rings true for you.