Caroline -
some of these "rules" confuse me. Who gave them to Danna?
No wet hair? No sweating? These aren't rules as far as I know. I attach my BP100 to my head w/wet hair all the time and have had no issues. I also know for sure that I sweat when I wear my processor. Although I don't wear it when I exercise (my preference), I do wear it all summer long and it gets hot and humid in Chicago. I've also worn it in other hot climates (San Diego, Colorado, etc.) in the summer months. The biggest thing with moisture - like wet hair or sweat - is to make sure the processor is allowed to dry out when it's not being worn. Danna should use the jar of drying beads (they come with Cochlear processors, I'm not sure if they come with Oticon processors) or she should look into a dry and store (example
http://www.dryandstore.com/ ) In fact, she should use the beads or a drying box every night when she removes her processor, after removing the battery.
To get the full benefits of the BAHA, it should be worn daily. I only remove mine for showering, sleeping, and exercising (again, my choice); lots of wearers don't remove the processor for exercising. The more you wear it, the more you get used to it - and the more it becomes a "part of your life".
BAHAs are meant to let the wearer live a normal life - which includes wet hair and sweating. It shouldn't be worn for times when the head is totally submerged - showering, swimming, etc - because the battery will burn out and the processor will get damaged.
As far as the feedback, that's a programming issue. I can reach up and touch my BP100 and it won't even whistle. Danna should see her audiologist. Sometimes the solution with feedback is as simple as turning off the feedback manager.
Jan