I stopped two months ago (from a low dose, i.e. 25 mcg patches) and was OK for about 5 weeks when the night sweats started to return. The sweats are the main reason I went on HRT in the first place, around 2015 (I'm 60 now) as I was getting drenching night sweats about every 2 hours making sleep impossible. It was Total Hell!
At the moment, I'm getting on average 2 sweats a night (2 a.m. ish then 4 a.m. ish), some drenchier than others, so already I'm in sleep deficit -- since I often can't fall back to sleep afterwards. I vowed to stick it out for 4 months to see if things settle out, which will take me till mid January, but I'm not sure I'll last that long.
If the sweats stay like this or get worse, I am definitely going back on HRT. But I figure my body is still adjusting and that I should wait as long as I can to see what's what. Not optimistic though.
As I said in a post elsewhere, I generally attribute my other symptoms (tiredness, grumpiness, irritability) to the lack of sleep, but who knows.
good luck!! Oh, and FWIW, while my GP said to ease off the HRT, the ob-gyn who performed a hysteroscopy recently told me it didn't make any difference whether you went cold turkey or cut back slowly on the HRT. The GP also said it takes a few months to get back to your own baseline hormone levels...she reckoned 3 months based on what she saw when a whole heap of women abruptly went off HRT after that very damaging Women's Health Initiative study came out. And I quote: "Three months later, they were arriving at the clinic by the busload demanding to go back on their HRT." I reckon that'll be me soon, minus the bus.