Your husband needs to see an Audiologist for a full hearing and middle ear evaluation. If you don't know of someone in your area, please let me know and i will gladly refer you (firstname.lastname@example.org). Hearing aids have advanced such a lot over the last few years and there are amazing options available that are technologically advanced and very discreet. It can be truely life-changing for him.
The other question that you are asking about the swimming have two sides to it. Firstly one would have to know whether the perforation in his eardrum has healed - ask your ENT specialist if it is safe. The fact that he is losing hearing might not be related to the perforation and if this is the case, it is safe for him to swim. It might be advisable to use swimplugs in his ears though so that one doesn't cause unnecessary exposure. You can also discuss the options for swimplugs with your Audiologist.
Please let me know if you have any further questions
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