I definitely had my symptoms wax and wane before I was on treatment, kind of in a "relapse-remitting" pattern. So while this is different from a Herx, you may be experiencing cycles in your symptoms, as many Lyme patients due. As a woman, I especially would experience a worsening of my symptoms around my period.
Night sweats are a symptom of a variety of ailments. Brucellosis produces a distinctive smelling sweat, likened to wet hay.
Google Jarisch-Herxheimer and read up on what a "herx" is. Hint: it's the reaction when bacteria are dying your body AFTER starting treatment.
I have never heard of a herx without taking anything. It usually happens in response to an antibiotic or herb. You could just get feeling worse at different times of the day.