Hard Puzzle

What lives as long as it eats, but dies when it drinks ?

It hurts the most when lost, yet also when not had at all. It is sometimes the hardest to express, but the easiest to ignore. It can be given to many, or just one. What is it?

It shouts along the street, has not any lungs. It tugs at leaves and hurls them at people, old and young. Who is it?

What is bigger than an elephant yet weighs nothing.
What is it?

It may be simple, it may be complex; it may have a name, but no gender or sex; it is often a question, or statements as a setup; it tend to have an answer, ’till you find it won’t let up. What is it?

You answer me, although I never ask you questions.What am I?

What is the end of everything?