Hi Maddison and welcome.
Scaredy Cat's idea about
the dream diary is a really good one. She's one smart cat! It sounds like your dreams must be pretty realistic. Do you worry a lot?
It sounds like you did a great job with the school counselor of figuring out what your friend drowning dream meant. By writing down your dreams as soon as you remember or wake up you'll be less likely to forget some of the details which can make it easier to later try to make sense of them. Your mind may simply be trying to communicate another worry, concern, or other message to you through a dream. And with them written down you may as SC said see patterns or even simply feel better just because they're written down. You may want to as you write your dreams also add how the dream made you feel. For instance, you could describe the image of your friend drowning and also about
how scary it was... This can help you further getting in touch with the underlying emotions of your dreams.
P.S. Mangoes are yummy!!