Well, please don't let it escalate into panic - that never helps anything with us.
Although it's unusual to have a herx reaction so soon after the first dose, it's not unheard of - and remember, you just started other things too! Those things combined could easily have given the abx a boost in the killing power, especially if you are using herbs that either have their own killing power or if you boosted your immune system - then your body is back in the fight as well.
Be sure that you are detoxing lots!! Remember, you want to get as many body systems detoxed and helping your body detox as you can. It's a careful balance of killing and detoxing.
Also, did you start off on a 'full' dose? If so, please reduce your dose and take the next one tomorrow.
Please do let us know how you are doing!!!