That sad news, Juha. Is your doctor very experienced with scuba divers, or can you possibly consult one more experienced in our sport?
I hope a physician here might give you some suggestions about treatment, but as stated in the Proplug link: "Once the diver enters greater depths (deeper than 20 ft with Proplugs), water will be allowed into the ear for equalization." They are really designed to help with equalizing, not ear canal infections.
My doctor is specialized to divers ears and he has been working with divers for about two decades now. He should be one of the best ear doctors around. Right now I'm really worried about everyday life with chronic ear canal infection because it's really painful and sleeping is impossible due to the pain.
It's a pity that Proplugs wont help me to get back to the water. On the other hand I hope that solid non-vented Proplugs prevent water from entering the ear canal and relieve the symptoms of chronic ear canal infection.