Yep, i experience the feeling in massive cycles - a week on, 2 months off, 2 weeks on, 3 months off etc. It's always in line with my mental/emotional state at the time - if I'm more anxious, it's worse, more depressed, worse. It's really bothersome because I know I'm pretty intelligent and sharp and it really gets in the way of my studies.
But there is a decent solution - MEDITATION! 90% of people that I recommend meditation to look at me like I've just served them a bowl of toenails at a dinner party. I was reluctant at first but it helps me stay grounded and aware of my body and mind in relation to the world around me. When I start experiencing that 'drunkenness feeling' I know I need to spend some time getting back in touch with my mind. Here is what I do:
1. Sit in a quiet place, comfortably, with my legs crossed & hands resting gently either together or on my knees.
2. Close my eyes, not tightly shut but relaxed, also relaxing all facial muscles
3. Focus on the rhythm of my breathing, keeping it at a constant pace - in through the nose and out through the mouth then eventually all through the nose.
4. Avoid thinking invasive thoughts - this part is essential. Essentially I try to think about nothing. When something irrelevant comes into my mind (e.g. what I'm going to have for dinner or a loud passing car) I imagine bundling the thought up into a piece of paper and throwing it into the bin.
5. Be aware of your body & how you're feeling - if you're anxious that's fine but think about why and how it manifests in your body.
I try to meditate for 15-30 minutes once or twice a day. I know it sounds difficult and it is at first but I promise it is the best cure to alleviate that drunkenness feeling. Let me know how it goes, Pat.