It turns out that my immediate side effects from the Rocephin (dizziness, slurred speech) are not normal or just part of a die off reaction. My doctor suggested pushing the medication more slowly.
Tonight I infused the drug over a twenty-minute period, instead of over about eight minutes. It was much easier. Just a little dizziness, no slurring of words, no muscle twitches. I think I might stretch it out to a thirty-minute period. In the end, it saves me time because I was pretty much incapacitated for at least 30 - 45 minutes after the eight-minute infusion.