Bicillin herx?

I got my first weekly bicillin LA Injection today. Just a few hours after the injection, I now have a massive headache, and much increased pain. Can a herx happen this quickly?

I've always herxed very fast to effective medicines. I'd mix in as much detox stuff as you can and see if you can find things that help.

In regards to herxing, I think it's a bell curve like with a lot of things. Some people will herx very quickly, others are on the other side and it takes them quite a while. I suspect it is due to various factors, including individual's detox abilities, pathogen load, and immune system genetics amongst other things.