why are pieces of the roof of my mouth falling off?!

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The tissue in your mouth can actually peel for many reasons. I had my entire mouth and my tongue peel after I ate a whole bunch of very, very vinegary potato chips. It can also happen if the tissue is excessively dry. Smoking or chewing tobacco can cause this too. It could also be a fungal infection, or it could even be caused by a change in toothpaste (did you change to a new kind recently?). The overuse of mouthwash, eating mints, prescriptions or medicines, etc can cause it too.

When in doubt, consult a doctor. Good luck!

It sounds like a virus or canker sores.