Answer:
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
What demands an answer, but asks no question?
No matter how little or how much you use me, you change me every month. What am I?
What loses its head every morning only to get it back every night?
Sometimes imaginary and sometimes real, sometimes they are the closest and dearest person outside the family. Who are they?
What can you lose that will cause other people to lose theirs too?