I just woke myself up from a nightmare. what does it mean?

I just woke myself up from a nightmare. It all started with me on my laptop IMing a boy [ I used to like] in a chat room with his friend about playing call a duty [a game I play often.] my cousin [who I rarely see] got into a argument with him and the...

chat room was filled with many people. the bell rang, but instead of a classroom it was a hospital type room where was a table in the middle, a computer on the side and as a few students left the room my global teacher [I don’t have global anymore] ask if we were studying peter pan [a fiction character]. a friend just told a teacher that she was suicidal [a situation I went through back in Jan.] I was telling her don't do it as we left the room. I was telling her father how to stop it and just going over everything I was going through. the hospital turned out to be the place where I was held for being suicide thoughts, my grandma death and a family friend death. the dream got crazy when my grandma touched this man who was bleeding out his guts. I said come on let me wash your hands. as I turned, she started to scream. the dead man guts was gushing out. the family friend stomach ripped in half guts, pouring out, him trying to suffocate me with his fist, my grandma dying and the suicidal friend and her dad dying in the blood rush. Blood was everywhere as everyone yelled “help us!” and the hospital did nothing.

what does this mean?

Just too be onness some nightmare meit come though and some that don't come though.

it could be you just had a lot of things on your mind that day you slept..doesnt mean anything bad..we have them all. I bet it just your thinking about all that stuff. your granman and the boy and so on.