Least, your post made me feel much more sane again. I didn't drink for some weeks last summer (was in hospital and had to take painkillers) and I felt so weird when I didn't drink for the first days but I thought it was just the side effects of my painkillers.
Then after being sober for some weeks I went back to daily drinking for just a week. Then tried to stop, drank again after 3 days, tried to stop again and that went on for 2 weeks until I finally stopped. I had quite bad withdrawals with shakes, insomnia, sweats, hallucinating and weird laughing / crying for no reason. I never understood how that was possible after just drinking for some days.
I even questioned if it was really a withdrawal or maybe just a flu or some stomach bug.