Frequency of PE
Five sessions of PE, one each day, is not common. More common is every other day (M, W, F, M, W or something similar). It can be done every day for 5 days—I have with no ill effect—but it depends on your overall health and tolerance for the process.
Godspeed in getting your neurologist up to speed. Have him visit the Peripheral Nerve Society website and click on the Medical Professionals page. He should find a link to the PNS guidelines on CIDP.