My experience of detox is that it tapers- you can get some nasty symptoms in the first fortnight or so and they tend to fade as more restorative work gets underway. It's not linear though, and I've read of other people who developed unpleasant symptoms later in the fast.
Lack of sleep is normal- I've read about it being due to the body being already in a restful state, that sleep is less necessary.
I've had similar symptoms to you apart from bleeding gums. The acid reflux was close to unbearable on my first fast, and lasted for ten days. It was really the worst. The only thing that kept me going was knowing that it was healing me, and the poisons were leaving my body.