@soccer1477, I'm sorry you haven't found any answers yet. The unknown can be a little scary and I think it's wise to seek a second opinion. It might be a good thing that the doctor recommended going to Mayo Clinic. There is another related discussion that you might want to read.

-- Anyone Living with MPA (Microscopic Polyangiitis) Vasculitis?: https://connect.mayoclinic.org/discussion/anyone-living-with-mpa-microscopic-polyangiitis-vasculitis/

The Vasculitis Foundation also has some information on diagnosis, treatment, living with MPA and more that might be helpful - https://www.vasculitisfoundation.org/education/vasculitis-types/microscopic-polyangiitis/

If you would like get a second opinion from Mayo Clinic, you can find the contact information for
the Minnesota, Arizona and Florida campuses here http://mayocl.in/1mtmR63.