There are several ways you can get your hearing tested if it's getting gradually worse.
You can get a free hearing test on the NHS. Your GP may refer you to a hearing specialist (audiologist) who can do the test.
It could take a few weeks to see the specialist. So it will probably be quicker to get tested somewhere else, like at a large pharmacy or opticians, although you may have to pay for this.
Always see a GP first if:
There are simple hearing tests online.
This can tell you if you need to have a face-to-face hearing test.
Lots of large pharmacies and opticians can do hearing tests.
The test is often free, but you'll normally have to pay for any treatment you might need (such as hearing aids).