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To be safe, note the volume level that allows you to listen to a 1,000 Hz tone without discomfort and do not stray too far above this level, even if you can’t hear much – especially in the high range, where your hearing is the most fragile.
Because the ear is more sensitive to high frequencies, the distortion may be subjectively louder than the fundamental 40 Hz tone (!), and may make the sound harder to tolerate, thus limiting the volume (and possibly the therapeutic effect). The best solution is a high-quality subwoofer.
I’ve been hearing a constant sound in my head. The sound is a mid-pitched whistle or whine similar to what you hear through the wall when your neighbor is vacuuming. The principal frequency seems to be about 1.1 kHz. Here’s the closest I could get when trying to generate the sound in my tone generator.