Frustrated and defeated

I am at my wit's end with my son's eczema. I have literally, and I mean literally tried everything to prevent his itching and flare ups and nothing has worked. NOTHING! I'm laying here now watching as he consistently scratch his hands, arms, legs, and head while whining. He scratches his head so much throughout the day and night that I honestly am still shocked he has hair. And I can do nothing but lay here and watch. It just really sucks when you know you've worked at something for so long and have tried your absolute hardest just for it all to be a failure. I give up. I just give up. At this point I'm not sure what else I can do. I soak him in the tub for 20 minutes every night, slather him in a trio of ointments and creams. He allergic to almost everything and I'm making sure he doesn't eat anything that he is allergic to that would cause his eczema to flare. I've spent hundreds of dollars on various creams and lotions for eczema relief, all for them to simply not work. I made sure all his clothes and bed sheets are washed in free and clear detergent. However, nothing has changed or worked. He still itches and scratches like there's no tomorrow. I feel so bad because there is nothing I can't do. He is left to itch and suffer 😞😣