NYCL,
hello!I am also on Abx.(orals and herbals and treatment for MCAD).
So I tried Clarithromicine with Rifampin and it almost killed me, too.The problem was I was not taking it progressively!
Maybe talk to LLMD so that he modifies your protocol or change your LLMD for another one.
I can not understand why you should start iv s if you could not tolerate orals?From my point of view herx should be worse.
My opinion is start low, and build up with help from an LLMD. Mayne start herbs and then move to Abx.?