Yes, my guess is that the source is Tolkien's letter, and only generally here; and that the Grey Havens are being mixed up with Tol Eressea (which happens enough it seems). But Man-maiden has a point that it's tough to say what's 'made up' here with respect to some things online, which is vague of course.
I don't read fan fiction, but what I can say is that it 'comes from Tolkien' that Frodo and Bilbo are still marked in some measure by the One, and seek healing Oversea.
What some fan might have made out of that...
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