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I really doubt it was Misery, because OP said the writer was female, at a vacation home, and only suspects a stalker, instead of male, kidnapped in a cabin and being brutally tortured by an obsessed fan. Plus the writer wasn't affected by any phobias, he just didn't like his character, who was in romance novels not detective stories, after she eclipsed his other works.

Some months ago I watched this TV movie about a writer affected by many phobias who wants to put an end to her detective stories by killing the main character. She goes to her vacation home, where she starts suspecting that someone is stalking her.
Can anyone remember the title of this movie? The first one to find it out will have my gratitude and some gratuitous vandalism on his/her wall.