I started a trial of Mexilitene, a sodium channel blocker, to try to control my pain - I have Erythromelalgia, small fiber neuropathy and fibromyalgia. After enduring worsening side effects from the Mexilitene (rapid heartbeat, dizziness, foggy brain, nausea & chest pain) I ended up in the hospital overnight to check my heart for any damage. Fortunately, there was none. The only benefit I thought I was getting from it was that my muscle spasms had completely stopped. Unfortunately, now I am wondering if I was getting more pain relief than I thought, because now I am in excruciating pain - I can feel every cell in my body and I feel as if I have razor blades going up and down my spine - into all of my nerves. Does anyone know if coming off of a treatment like this can exacerbate my condition, or was I just in so much pain and am now feeling it now after having it be dulled for a while? Just looking for similar people out there.