Loss of Hearing

There is a switch on a hearing aid called T. What is that short for???

Seems an elderly gentleman had serious hearing problems for a number of years.
He went to the doctor and the doctor was able to have him fitted for a set of hearing aids that allowed the gentleman to hear 100%.
The elderly gentleman went back in a month to the doctor and the doctor said, “Your hearing is perfect. Your family must be really pleased that you can hear again.”
To which the gentleman said, “Oh, I haven’t told my family yet. I just sit around and listen to the conversations. I’ve changed my will three times!”

I get ear, nose and throat infections once every 3 months. Is this something that could lead to something serious in the long run and could this lead to hearing loss?

He is currently wearing a behind the ear aid, but it seems to annoy his ear, not to mention him.
Do you think a canal aid, would be appropriate for him, or that he will just lose his aid??
Anyone have any ideas