Hello Teresa,
David is on vacation this week, working at home on papers, but he can be contacted on his new email address, which you can find at the bottom of the page here:
http://www.davidwheldon.co.uk/ms-treatment.html
This address is checkable either at home or work, so if you write there he will get it sooner than later.
The way you react when on flagyl seems par for the course, also the fact that you didn't react much to the first two antibiotics. Some people have massive reactions and this tends to be taken as a positive sign, but apart from some fluey symptoms when I first started, I experienced very little.
David always says that the main thing with any treatment is to first stop the downward progression of the disease. If you have done that, it is a very big first step. I know you weren't as bad as me, but then neither was your disease so active, so it is very likely that you will find it more difficult to gauge any improvements.
I don't know if you have looked at David's page recently, but there is a lot of new information on it, especially on the qualities of various supplements which you might find useful.
You might also care to contact Katman, aka Rica, who has PPMS and took abx for quite a few months before she showed any improvement at all. Her husband is an obstetrician/gynaecologist,she used to be a professional violinist, and they both farm dairy goats in Carolina. She is now doing amazingly well.
You can also find more information here:
http://www.CPn Help.org. Both David and Charles Stratton from Vanderbilt have given a lot of information, and many people who write here also write there.
Take care,
Sarah