I feel LESS sensation in warm water. RSD is complicated (understatement...) so you'll just have to decide if you can handle it. In theory, I guess it could help you with desensitization. I'd rather calm things down, personally. You might be able to get a refund if you explain the issue. Have you tried an Epsom salt bath? It changes the texture of the water, makes you more bouyant, and the magnesium is beneficial.

Usually pools will let you try out a session before committing for any others considering aquatherapy.