Get horse in a dry environment like a well bedded dry stall. Use Durasole on the soles and make sure the horse doesnt not have thrush. The best way to apply Durasole is to take a hairdryer and dry the soles really well for about a minute and then use a toothbrush and brush the Druasole in. It will soak it up. If you apply it to a wet foot, it will mostly run off and be wasted. You can do it a couple times the first day. It will help most horses with sore feet. It builds an fast callous. You will see if you get any on your fingers. (I hate the feeling. I wear gloves)
If the feet are that bad, pull the shoes as they are just ripping the wall up anyway and making it worse sounds like. Durasole and a dry environment are next. Dry feet are harder ad more sound. If the horse is still sore, you can apply resin hoof casting to add support and it should instantly make the horse comfortable. You do NOT want a horse with casting standing around in wet 24 -7 at least half the day needs to be dry in a stall. There are limits to riding with casting. They wear out at the toe but so long as they are on tight, they can be left on.
You also may need another more skilled farrier and you may need to address some dietary issues. The problems you describe are usually the result of poor hoof work, diet issues and/or long term poor work that has just caught up with the horse considering th ebad weather. These are the kinds of horses I pull the shoes off of and rehab them bare. I do not consider a horse as sound who can't walk around his pasture barefoot in a couple days of pulling shoes. That usually means the horse has a big problem in trim/diet.
Also hoof boots and pads can provide temporary protection but they do not do well in wet environments and you must dry the feet out still once a day. Post pictures and we can give more opinions on the work the horse is getting and the overall hoof shape/trim. http://blog.easycareinc.com/blog/bar...t-a-click-away