Dude.
You nailed the reason for this post, actually. After 41-years, I know what to expect from my body. What prompted me to write this was that I was not feeling the same as before and, like you, I'm finding that eating makes me feel worse, not better. It used to just be a dull, malaise feeling. This post is because it feels much more present than before Thanksgiving. Like a head-rush or from drinking too much coffee. However, my coffee intake hasn't changed over the years and I usually am done drinking coffee by 9-10am. Eating or not eating leads to slight nausea, a head-rush feeling (as mentioned), and almost like minor movement is slurred or delayed.
Ruling out illness or some sort of late-onset allergy, and given my family history, it got me thinking that these ill feelings may be the indications that I'm tipping more toward the diabetic side of the scale after striking a balance for so many years. Thank you for your reply!