Spanky,
With just a slight hearing loss and a 4K notch in just one ear, I don't think the benefit and expense of a hearing aide are justifiable.
For one thing, to get you amplification at the 4K mark will require mechanically blocking your ear canal and thus making it necessary to amplify the entire range.
I went for YEARS having one ear fixed and the other quite deaf and that single ear can do most everything that 2 can do...EXCEPT tell where a sound is coming from.

A 4K notch is usually caused by noise trauma, either sudden or sustained.
I don't think you'd be happy with a hearing aide.