Answer:
Everyone has me and no one can lose me. What am I?
I can be swallowed, but I can also swallow you. What am I?
I'm blue, but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt, but I'm good for you. What am I?
Only one color, but not one size, stuck at the bottom, yet easily flies. Present in sun, but not in rain, doing no harm, and feeling no pain. What am I?
I am the only thing that place today before yesterday. (one word)
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?