What does this dream mean?

I had this dream of the ocean rising... It started raining, my brother and my friend were with me. We were walking together along my main street. My brother in real life has a crush on this friend of mine, so in my dream I was going home but he wanted to stay with her so I left him and her alone and walked away. The next thing I know I'm at My ex-mother in laws house looking out the window. There was the most horrific sight I have ever seen, the clouds were dark, It was still raining but on the next block I could see the ocean covering all of the town that is next to us. The water was so blue and beautiful but is was streaming so fast and rising even faster. I thought immediately of my brother and ran out the door to search for him.There were people everywhere running on the street, everyone was looking to get to higher grounds. One family was in a hummer, I asked the father to please drop me off where I last left my brother, but he was going the opposite direction. I got off the car and proceeded to look for my brother. All i kept thinking about was finding him and feeling the anxiety of losing him. My phone was ringing in the dream, the ring tone was my boyfriends it was ringing and ringing and that's what woke me up was him calling me in real life as well. I was crying and felt relieved that he woke me up, but immediately looked for my brother in the room. He was sleeping.