susan62, welcome to the board
Unfortunately, there are not many Lyme doctors and many people need to travel to see one. I believe that many Lyme doctors are internal medicine but there is no one best specialty. Often, infectious disease doctors are not the best to see for tickborne illnesses.
I do not know of any Lyme doctors in IN. Hermitage, PA and Springfield, MO are the closest to you that I know of. If you would like one of their names, let me know.