https://lifehacker.com/this-weird-trick-might-give-you-brief...
I don't suffer from tinnitus, but I know people who do and some of them have said that this helped them.
Edit: never knew telling your experiences gets you downvotes.
I think this case is more specific than that: expressing personal experience as something that must therefore be true for everyone often gets you downvotes, at least here, unless you experience agrees directly and completely with local group-think (and even then some who disagree with the local group consensus will downvote without explanation).
Frame personal experience as personal experience that might inform others usefully, rather than framing personal experience as solid undisputable globally applicable fact. You'll likely still get some downvotes of course, no matter what you say or how you frame it.
"Trust me, it never helped me" is entirely different.
It works momentarily, but that's it. Not enough to provide any actual relief and does nothing for the situation long term.
It's more or less a party trick for people who are suffering from this.
Getting on the upper deck for fresh air
Having a full stomach
If all else fails, sleep
Seeing the horizon vs focusing on a fixed point on the ship helps some people and harms others - experiment to see what works for you.
The other thing I've found is if you let it get bad you'll be in trouble until you get ashore. Take measures to fix it before it gets bad. This might include drugs - I'd always take dramamine if sailing into bad weather.
Also, everybody gets seasick eventually. Anyone who claims they don't simply hasn't been in a rough enough sea for long enough yet. There's no shame in taking care of yourself.
One last trick - ships have a metacentre that they rotate about. Ask a deck officer where on the ship you can get closest to it - it's the point where the movement of the ship will be minimised.