My struggle with fatigue has been going on some 35 years post-trauma. The intensity fluctuates over broad cycles perhaps 2 years in duration. It'll be intense for a couple years (and I mean stay in bed and that's it; trips to the bathroom and trips to the kitchen are done on different days to conserve strength), then lighten up for a couple more years.

I would say that over the long stretch, the intensity has generally declined (with fluctuations). Currently I get about one intense but short-lived session a day, of an hour or so in duration, and I generally must sleep twice as long as most people ( a good 16 hours a day).

My gut feeling is that the fatigue situation will continue to improve, but will take time- I mean thinking in terms of decades, not years. Probably not what you want to hear, but remember your situation may be completely different from mine.