Like @Mno said, everyone’s different. I’ve seen people who drank all day everyday quit without any major symptoms, I’ve also seen people who only drank a few drinks a few nights a week have seizures from quitting…
I would say, though, what you’re describing is par for the course. Alcohol withdrawals has a wide range of symptoms; from mild to severe. They wont last forever, and after a few weeks, it’ll get a little better each day.
I think the worst part is the mental aspect. There is definitely a mourning period. One thing that helped me in this time was changing my relationship with alcohol. It went from like losing a friend to having a huge weight lifted off me and being free.
I wrote about my journey here: