With my relapse in March, after the sinusitis that triggered it subsided, and after 3 weeks of Biaxin, I was on 5 weeks of Doxy. March into April, the vertigo ws subsiding, but I still felt like my head was not quite in the same place as my body. In all that time, it never felt really flu-like. It was mostly all pain, all over and moved around, in muscles, joints and the doctors called it parasthesia but I didn't have tingling in my nerve endings, only pain all over my skin, mosly hands and feet. It was never unbearable, but it was not going away.
In May, when I began the IV ceftraixone, I found out what herx really was and it was really good that I knew to expect it or I would have thought I belonged in the hospital or something. I felt weaker than I think I've ever felt and no energy to move, and for several days the pain was worse, and it was almost imediate, within 48 hrs. of the first dose. Then, ever so slowly day by day, week by week, everything improved. The only place that still hurt was my back, but I had also fallen down the steps in March when I was still having vertigo.
By June I was still weak, and tired, but partly from the meds. Oh, I was on Flagyl the entire time I was on the IV and for a week after. I still have slight stiffness in my knees and neck on and off, but I've been doing a lot and not streching enough.
I hope this helps to answer your question. I don't know if I was herxing in April or if the disease was just causing all of the symptoms, but I definitely did herx in May, once on the IV.