There is a website to do your own hearing test that sort off mimics the NHS one https://hearingtest.online/
You've probably lost some hearing around the 5k Hz range, most people do with age, go to your Doctor and get a referral to the NHS Audiology clinic, their hearing aids are free.
I tried some private ones for a month on approval, yes they were better than my out of date NHS ones (I'm due to get some up to date ones in Feb) but not £3k better.
They do take some getting used too, it took me a year and they still don't handle noisy environments well, but I would be without them