The very worst withdrawal symptoms I've ever seen, bar none, were in people coming off benzo addictions. Heartbreaking to see, it was horrible and it lasted for a couple months. And there wasn't much the docs could do, so folks had to just muddle through somehow. I personally would never take benzos for any reason, based on what I saw, they are quite addictive particularly with people who have had alcohol addiction issues, and getting off them can be hell.