It's very possible it is kindling, or just age. I know as I got older, hangovers went from just a minor annoyance, to feeling like absolute garbage for days. I also use to be a once a day drinker for years, then that evolved to bender drinking for about 6 months, and that's where the real hell began with horrific withdrawals, I'm pretty sure I had DT's twice, hallucinations, freaking out,.. it was not a fun experience.