It seems I stopped feeling tired on it, and started getting jumpy and on edge, then downright angry. Go figure. I don't recall it doing that to me the last pregnancy, when I got relief with it, but I was fine this morning, til lunch, then took some, and spent the afternoon increasingly edgy, irritable, and ready to fly off the handle at anything and everything.
I found the manufacturer's note on side effects, here.
After I took it last night, I noticed I had about half an hour of my legs feeling jumpy and restless, but didn't worry.
But this afternoon was awful. Was just about grinding my teeth, annoyed with my poor kids even if they approached me for a hug, and just feeling prickly. That is not normal!
So for those it works well for, great! It did for me, until this.
But if anyone else feels unusually easily angered or jumpy while on it, just be aware that is one possible side effect, however uncommon.
Just to be sure, if I feel like this again despite not taking it anymore, I will report back, because that will clear it of being the cause.