Things that will help - make sure you are wearing a supportive bra that fits correctly. This will help prevent sagging in future.
You can also use lotion rich in Vitamin E to promote your skin's elasticity.
These things might help a bit, but as I said before, breasts sort of are what they are. I'm assuming you've got some sort of special occasion in October.
If it's an occasion for clothes, there are fantastic bras that can flatter your form in low cut or tight tops. If it's a 'different' sort of occasion, realize that other people probably are not as harsh about your body as you are. If you relax and enjoy what you've got, life will be more satifying in every way.
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