After being on oral antibiotics for one month back in February, the pain and stiffness in my neck practically disappeared. IV Rocephin was added in March and I've been on it now for 7-1/2 weeks. I definitely herxed when I started the oral antibiotics but never felt I did with the Rocephin other than feeling even more fatigued. about a week or two ago, the neck pain started to return and now at times it's even worse than it was before I started treatment. Could this possibly be a herx from the Rocephin?