Please help !

Our 4 year old labrador has some very serious scatching and skin issues and I dont know what more I can do. She is absolutely miserable and has bl0ody patches off her everywhere!

It started at the beginning of spring/summer. Only this year. She started scratching at the top of her ears after spending some time out on our other property. We took her to the vet after they refused to heal and they took some scrapings. There were no mites to be found. She was put on mild steriods and antibiotics and they eventually cleared up only to come back again once the steriods stopped!

It got so severe that we had to put a bucket on her head and once they were healed, another set turned up else where. Again to the steriods but even they arent very effective now.

She has pancreatitis so is limited in fat intake. She's been on a special diet, previously rice and veges with lean meat, now a lean dog food. The change in diet happened long before this issue and it was changed on the advice of the vet for more vitamins.

She is outdoors.

She has been flea'd and everything else that goes with those things, and wormed.

Currently she has these bald, blo0dy patches from her face, her ears, her legs, EVERYWHERE! Im trying to keep them clean for her, and after the bucket she doesnt scratch them as often and I tell her off each time she does but I cant be there 100% of the time.

We've tried bathing her in a special antibatical, antifungal type stuff and it didnt help, tried oatmeal for dogs type shampoo. Tried no baths, more baths. We've gone so far as to have her nails clipped really really short.

I dont know what else to do for her. She is miserable, she will whimper because of the itch and scratching. Shes brushed regularly.

What else can I do? What else could it be? I dont want her to suffer anymore?