It could be that you are extra sensitive to the vibrations of the
ultrasonic cleaner. One of my friends who is subject to migraine
headaches noticed that the vibrations and low level hums (even very
low ones) from various electrical appliances would trigger her
headaches. Sometimes these vibrations and sounds were almost
inaudible to the rest of us in the room, but she could detect them
and they would bring on excruciating pains.
Can you set up the ultrasonic cleaner in another room from where you
are working and see if this helps?
Alma