Answer:
Upon your lonely journey I accompany you, whether you travel through endless mountains or seas of blue. Wherever you go, I keep your place. Lost you're not, when I'm embraced. What am I?
If you lose me, you may cause people around you to lose me too. What am I?
I am the only thing that place today before yesterday. (one word)
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
What loses its head in the morning but gets it back at night?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.