I Have Had Itching Burning Throbing Inner Ear Canals Since

I have had itching burning throbing inner ear canals since December. It happened 10 days after I had highlights in my hair. However not sure it had anything to do with it. I also got hit in the ear hard the day before I noticed it. I woke up my ear was sore a had a little blood in it. Went to doctors several times. Been treated with topical and oral steroids. Antibiotics. The only thing that gives me any relief is benadryl but it doesn't take it away. It's awful. It seems to be worse when wet. The doctors see nothing wrong with my ears.