Why do i have... Shortness of breaths ?

Why is it kinda hard for me to breath and when i got up from my bed i got dizzy i kinda lost hunger but i ate today and like sometimes i feel weak but it's kinda going away why do i have pain in my lower back ? Can i have stones from soda i barley drink water anymore can i faint ? Why is this happening i have stress in my life also but this didn't happen please help