I've never had an ear infection but in reply to the OP title I do suffer from hearing loss.
I was first diagnosed around 6 years ago when I was 38 with degenerative hearing loss, and told there is nothing that can be done to rectify it.
I put it down to working in hotels for the first 8 years of my working life, (discos and jukeboxes etc), and being a child of the Walkman generation. I use to wear mine all the time, even when I went to bed, it cost me a fortune in batteries when auto reverse was invented!
Anyhoo I was given a hearing aid for my right ear at that time, but I now have them for both ears. I also have slight tinnitis as well but not at a level that drives me to distraction.
My loss is in the higher frequencies and I struggle to filter background noise, in a restaurant for example converations would just be a mish mash of noise.
The aids help for the most part, but as I work with plant machinery I don't wear them for work because even though they're obviously tuned for my loss they still amplify everything which I would find too loud.
I've no direct experience of how private aids compare to mine as I couldn't afford them even I wanted them, but IMO the only reason to spend 1000's on something you can get from the NHS is vanity. An Uncle of mine bought a pair from Boots, which IIRC cost him in excess of £2k, and I know he had no end of trouble with them. Mine just work, sure they're not pretty but neither am I so that's OK