Lowering dose of abx - results immediate???

Trying to figure out if my pain during the night issue is caused by herxing.
Yesterday I lowered my doxy dose - cut it in half. When should I see a difference?
I didn't have a good night last night again. Very sore.
So, I've continued with the half dose...and see how it goes tonight.

I guess it could take a couple days before it's out of my system. Maybe tonight will be better.