Answer:
I tremble at each breath of air, and yet can heaviest burdens bear.
I'm a type of pizza that is folded in half before cooking to contain a filling
I can ruin your day, or darken your life. And while I'm expected, I'm never alright. I'm bad for business, and worse for your hair. Wherever I am, there's something not there.
Half-way up the hill, I see you at last, lying beneath me with your sounds and sights. A city in the twilight, dim and vast, with smoking roofs, soft bells, and gleaming lights.
Though desert men once called me God, today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?