Go to a doctor.
Unless anone here is a doctor, and even then, it's impossible to give a diagnosis without actually seeing you.
All other advice is nonsense, even if it does turn out to be correct, as it is only, at best, guesswork by someone untrained.
If you were experiencing pain with something such as playing octaves, then it would be easier to help you. But as the pain isn't localised, it suggests a problem that's more than just 'piano-related'.
But even that comment is conjecture lol.
Best to go see a doc.
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