Carol, I have finished taking full-time abx and now just take two week every three months, as you can see from my signature. I still take 4000 iu a day of D, sometimes a bit less in summer and I took it throughout the antibiotics.
Herx is a much misused term, but I did "herx" in the correct sense in the first couple of weeks of starting. I had no more reactions to metronidazole after a year, so Dr. David Wheldon, who I am actually married to, deemed it was time to go on to just intermittent therapy. I am still slowly improving even whilst not taking abx.
Since people with MS show a deficiency of D it is wise to carry on taking it. I got the idea first from the Best Bet Diet people. David is a clinical microbiologist with special interest in virology to give you his correct hospital title and he discovered the work that was going on at Vanderbilt, so started me on antibiotics. If he hadn't, I was deteriorating so quickly over the previous three years, I would be dead by now, although not yet 50. I didn't think it would help, being at the time someone who thought everything was treatable by natural means and a good diet. I was completely dumfounded. There is more in the Regimens section about my treatment, because the Antibiotics section wasn't here when I first started.
An Itinerary in Light and Shadow Completed Dr Charles Stratton / Dr David Wheldon abx regime for aggressive secondary progressive MS in June 2007, after four years. Still improving with no relapses since starting. Can't run but can paint all day.