Need Help with Nerve Pain 2 Yrs After Treatment

Help!  My husband is having terrific nerve pain in both arms and it's been over 2 years since he was treated for Stage 2 Colon Cancer.His course of treatment was Oxyplatin 5 FU.  He is currently taking Lyrica and Tylenol 3 but it seems only to 'at best' just take the edge off, before the unrelenting ongoing pain radiates up and down both arms, between his shoulder and wrists.  Please.....does anyony have any suggestions?  This is adversely affecting his sleep, his personality and our family life.  I don't know what else to do to help him.  He has recently bought and started treatment with an Inferential Machine.  Suggestions?