I had the same problem that you described and simply changed whistles and that corrected it. Fox40 made my ears ring all night. I use an old Acme whistle with the little bead in it and have no problem.
Also tried the noise reducing ear plugs to reduce certain pitches and frequencies, but thought I was missing too much on the court and couldn't get comfortable with them.

just curious - how did they make you miss thiings. :confused: With mine I hear everything - it's not like sticking one of the industrial ear plugs in. Perhaps we aren't talking about the same thing.

Mine was molded to fit inside the ear canal so it couldn't be seen. there were no batteries or electronic device with it. It had a small hole it. Can't tell you much more than that. I still use them for loud events, but for officiating I'm just not comfortable using them.

Mine were molded as well - no electronics involved either. I wear them a lot depending what my teaching assignment is. If in front of a large group band for example - definately wear them all day. This year I am doing choral and don't use them as much. Being that I had to wear them all the time when I got them - I became very comfortable with them quickly.

Here is a whistle you might want to try. Best Whistle
I will get one before soccer season starts. I won't give it a try in Basketball because our local association specifies the use of the Fox 40

Can't believe no ones said this yet...
 

Must be a regional thing...