I've got it, bad, but it's from playing R&R for many years without earplugs. Searched for things to alleviete it, tried lots of stuff, and found one thing that actually works. At least temporarily. A little hard to explain but I'm gonna give it a go...
Put the palms of you hands on your ears with your fingers cupping the back lower part of your skull. Put pressure on your ears and then tap your fingers on the back of your head, you'll hear like a boingy kind of sound. It was suggested to do it around 30 times, but sometimes I do it longer. Actually works for me to a certain degree.
I also found that if I just hold my palms over my ears, push hard till the ringing gets really loud and hold that for a few seconds, it helps too.
Lots of other "cures" you can find on the internet, but none of the others I tried worked.
I've a feeling yours is just temporary, but hopefully the above can give you some relief.