If your IgM was positive for Lyme, then that needs to be taken into consideration and you need to see someone also. I don't know what you mean by "high". Did you get testted for Lyme or just an antibody check?
From what I've read on my Igenex report, there is a "positive" where bands are clearly seen at a higher intensity, and "ind" which is where bands are seen but not at the high intensity and "negative" where no bands are seen at all. To me, "ind" (indeterminate) means probably positive.
What they do, from what I read on my flyer they sent with my report, is that they take your IgG and IgM (immunoglobulins) and react them with the Lyme bacteriums.
Also, note that both do not have to be positive, they run both to see where the illness may be in your body, and such.
The IgG, if positive, says you have been exposed to the B. Burgdorferi (the causitive agent of Lyme's).
A positve IgM is an indication of early Lyme infection, recurrent, or persistent infection. (Please note I am reading this directly from their flyer).
It says the IgM presents first, then the IgG. It also says that in late stage Lyme, sometimes only the IgM is shown to be positive.
I would advise you to be checked by a LLMD, if you had the Lyme's test and were psoitve IgM. I am no doctorm just giving advice as to what I would do. My doctor is the sdame way as yours, and forget about a "regular" neurologist knowing about this stuff.
The more I read and learn, the more I am convinced I have been at least exposed to this stuff, and will explain so many things (actually for me and my wife).
I will learn more as I go, but I hope I have helped.