That buzzed feeling and brain fog were common for me - at least parts of every day for four years! - but literally have not happened to me again since I stopped eating high-histamine foods. Any chance you are experiencing histamine overload?
Common foods and beverages that can do this to people are: citrus, tomatoes, alcohol, vinegar, kombucha, yogurt, kefir, very ripe fruits, salad dressings, pickled foods, fermented foods, kimchi, leftovers, aged meats, cheese, lion's mane mushrooms, some other mushrooms, coffee, chocolate, sourdough, miso, nutritional yeast (brewer's yeast), and anything that has set out for a while.
This is all part of the MCAS situation for me, so a low-histamine diet helped tremendously, along with curcumin (might be easier on your gut than turmeric, since it's just the extracted curcumin), quercetin, bromelain, vitamin C, and DNRS limbic system retraining. This combination stopped my neurological symptoms almost entirely, including POTS, brain fog, headaches, dizziness of all kinds, dental nerve pain, gastroparesis, and peripheral neuropathy. Your mileage may vary, but when you mentioned the drink feeling, that was 100% histamine for me. (The drunk feeling healthy people get from drinking alcohol is also partly caused by the histamine reaction!)
Another possibility is auto-brewery syndrome, wherein things literally are fermenting in your gut and making you drunk. But MCAS seems much more common!