I am so scared of rain and thunderstorms.?

Please help me guys, I am really scared of rain and thunderstorms, I live in Kuwait, I am scared because when I was in the 3rd grade a flood happened, And now i am scared of the thunder and lightning, please help me. I am so scared!!! TELL ME WHAT TO DO!!! I think I am gonna cry, it is so hard on me. I am only 12, it is so creepy, what does isolated thunder storm mean???