A bluetooth headset is a good idea so that you can use your cell phone while on the go. It isn't safe to be dialing numbers sports earpiece while driving and it can be very inconvenient when you travel for work. This is a hands free device that allows you to complete your calls with ease.
If your hearing loss cannot be addressed by surgery or identifying another health condition you may be able to amplify sound with a world cup earpiece. This device amplifies sound, but does not repair your hearing. There are many devices available for you to choose from. They vary in price wildly. It will be best to work closely with your audiologist as there are many types that offer varying features. Smaller models may be more discreet, but they may not be for your level of hearing loss. You may also find that some of the larger models offer features that would make your life easier.
You may decide to use a spy earpiece camera to catch him cheating. This is the best option if your business requires frequent travel. If he's cheating on you, the most likely time will be when you're on a trip. Installing a camera in both the bedroom and the living room will capture him cheating if he is indeed cheating. There are many car phone cameras that resemble ordinary household products. For example, you can get an alarm clock, boom box, book, wall clock, smoke detector and more, all with a video camera embedded.
The Motorazr V3 comes with Bluetooth, so if you purchase the hand free earpiece, then these can be used together. As I only use a couple of hundred minutes during the week, this wouldn't be worthwhile for me.
There aren't any waterproof hearing aids on the market at the moment, there is however quite a lot of demand for such a product to be made. There is quite a lot of research being done at the moment to try and find a way to waterproof hearing aids, and you can bet your bottom dollar that as soon as they figure it out they'll sell like hot cakes!