I agree with the dehydration theory. I suggest that you focus on the basics of adequate hydration, quality nutrition, and consistent sleep patterns for a few weeks to see if your symptoms improve, before considering other diagnoses.
I am an Audiologist (hearing and balance specialist), and while @sakura is correct that there are inner-ear disorders that can make a person feel drunk, you do not mention imbalance or vertigo as part of what you experience (and as disconcerting as dysequilibrium is, I believe you would have mentioned it if you had it).
Should your symptoms persist despite making lifestyle changes to make wellness a priority, then ask again, and be very detailed in your description of your symptoms.