When I went to detox in 2011 on the first day I was in the 'fish tank' glass windowed room across from the nurse's station and was really a mess. The next day they put me in a dorm and I was feeling a little better and went to a couple of AA meetings but the third day I had a seizure and was taken to a regular hospital and spent a week there, three of them totally lost to me but for one brief and confusing dream. At that point I was on an IV Ativan drip, with thiamine and potassium as well. After that nightmare I went to rehab for two months.
It's true for me that 4 days was the time I would tend to relapse. There is also the phenomena of kindling where each successive detox is worse than the last. It's a real thing.
I wish you all the best on your sober journey and hope you're feeling better soon.