I think living with hot flushes on long-term ADT is a combination of 3 things:

1. They become less common (I used to get them just from thinking hard about something).

2. You learn to spot the triggers and early warning signs, and head them off before you're soaked (e.g. peel off a layer, get to a fan early, try relaxation exercises to keep the hypothalamus from firing off on all barrels).

3. You get used to the remaining ones that 1 and 2 don't take care of, so they're less of a disruption.

In just 6–12 months on ADT you don't have time to learn and develop any of this, so it's natural that hot flushes would seem frequent and almost unbearable, but in my own experience they get much easier over time.