I fully accept that different people have different experiences coming off of a drug. I should have mentioned in my case that was about 8 months of daily use, although the withdrawal symptoms shown themselves very quickly (less than a month after I started taking it regularly).
I personally feel sluggish the first days if I stop coffee for a while, but even after drinking coffee every day for a comparable period of time, I don't instantly feel the withdrawal creep up on me as soon as caffeine (mostly) leaves my bloodstream.
For added context, at the peak of my consumption I would take about a teaspoon every 4-5 hours (consistently as this was the time it took to feel the cold symptoms again) through tossing and washing (just swallowing it down with some water). I've no experience with Kratom pills and no amount of sugar can possibly overcome the intense bitterness of Kratom tea at that dosage (and I like bitter).
I wonder if perhaps there is some kind of genetic factor.. it's very strange in any case.
It really is strange the way many people have negligible or no withdrawal symptoms, and others report that they do. One theory is that you didn't just take kratom - there are known cases of it being sold mixed with synthetic opioids (o-des-tramadol is one such, from memory).