I can definitely relate to the fatigue and I haven't even had Lyme for very long. Sorry you're having to deal with it again. I've heard it's common to have a few good days and a bad day, or one good day one bad day.
Somtimes even in the same day I feel like I'm getting better, followed by feeling like someone beat me with a bat, sigh. i've heard thats normal too.
Hope you feel better soon.