Hello Clairehobby, great to hear from you. Fabric storage is an ongoing issue for quilters - there's many different ways for storing fabric. One alarm bell rang in my head when I read your post - if you fold your fabric and put it on your bookcase - it will fade on the fold lines. Even if you've got fluro lights or no lights at all, it will naturally fade on the parts of the fabric that's exposed.
Plastic boxes are a good idea - they stop the fading and you can see what's in them. If you can get your fabric into a cupboard that has doors - I store my fabrics in colour ways in laundry baskets. I can see through them, and it's easy to see what I'm after.
Perhaps some other quilters have some ideas for you.
Have fun with your stash.
Cheerio for now