What To Do For Problem In Child?

isr my son 10 yr old suffering from aidp as declared by pgi chd wen he was at 5 feel weakness in legs assending problem to facial parasis we went to a neuro physian in ludhiana he gave him ivig recovered within 10 days it was occured in march 2005 after 6 mnt in november 2005 the same thing attacked on him then repeat ivig recovered him within month after that in march 2006 same problem we went to pgi chd after ncv & nerve biopsy dr p singhi HOD gave him steroid with taperoff process of 7 mnth he recovered almost within 2 mnth but now after 4 yr in march he feel the same after ncv dr singhi gave him steroid taperoff in 1 month he recovered in 15 days wat is the future ?