What's the Name of That Book??? discussion

I'm sorry that it's vague and I might have misleading information here and there but it's been almost 20 years since I've read this. I'll try to write down the most accurate ones.

The book as I recall takes place in a normal world at the start. I remember that the protagonist, a teenager girl possibly with red hair, has always been haunted by some (maybe just one) evil creatures that are a menace to her. Only she can see them. She is short sighted. At a point she figures out that she can do things to them when she takes her glasses off. Somewhere in the novel she meets a guy her age who I believe

*POSSIBLE SPOILER AHEAD*

was made of sand and had to be kept moist so that he doesn't crumble and get blown away with wind. I remember his name as Sebastian but I could be wrong.

Does this female protagonist live with her grandmother? and suffers from a weird sort of vertigo? Does a sickle or crescent moon have to do with anything? Is there some point at which she realizes she could be or is a sorcerous in a 2nd world/alternate reality?

Now You See It... by Vivian Vande Velde sounds a LITTLE similar and was published 2006

Ketutar wrote: "
Now You See It... by Vivian Vande Velde sounds a LITTLE similar and was published 2006"

I've checked and this doesn't seem to be it.

Stephanie wrote: "Does this female protagonist live with her grandmother? and suffers from a weird sort of vertigo? Does a sickle or crescent moon have to do with anything? Is there some point at which she realizes ..."

None of these ring a bell. Maybe I'm not recalling it, maybe they don't have anything to do with it. Which book is it?

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Just a description about Now You See It . . . by Vivian Vande Velde on Amazon: "When Wendy, 15, finds sunglasses that fit her prescription perfectly, she begins to see little blue men and realizes that a popular girl in her class is actually a 90-year-old crone, and that the new kid has rather long pointy ears... A wayward thought transports her back 50 years before she was born, and she meets her grandmother as a young girl."

Sena, what do the evil creatures look like to her?
Can she see them with and without her (eye)glasses?

Can we eliminate The World Around the Corner by Maurice Gee?

Definitely YA, not middle grade?

Was the girl a high school student?

OH. MY. GOD.

I was talking to my best friend on the phone, one topic led to another and guess what; she randomly reminds me of this book.

It was "Peggy Sue and the Phantoms" series by Serge Brussolo, in fact probably the first book. It's originally in French and I guess was more of a child's book than YA. Here it is: https://www.goodreads.com/book/show/9...

I am finally at peace. Thank you all for trying.