At one point in my life drinking coffee would give me vertigo. I ended up going caffeine free for a couple weeks until I am guessing my anxiety went down enough that drinking coffee wouldn't give me vertigo. Since then there have been a couple times in my life where I needed to cut back coffee before things got bad again. Now I typically have one and a half cups a day and I am ok.
How interesting to see this here. I've reduced my caffeine intake from about 6 cups to drinking only socially. Different than the article, I did have side effects. Especially during the afternoon a foggy haze would descend, that I would be quite sure would disperse at the first sip. But that's mostly gone now. I take it as an indication that it was high time to kick the bucket.
Twice now in the past 2 decades I've gone more than 24 hours without coffee.