what are dreams that formed when you are asleep?

i often dream when asleep.. sweet n bitter.. but more often nightmares that make me cry in the dreams n wake up with tears.. or nightmares that i will scream n wake up from the scare.. i had a nightmare last night.. it was a terrible one.. i fainted in the dream n woke up with chest pains.. i was perspiring n couldn't breathe properly.. it feels so real.. i can see the faces of the people and hear the voices of the people in the dream.. i hope it's jus a nightmare, nv shld it be real.. i can't take the truth if it's real..

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i guess i m one who cant share certain things with other people, one of which will b my partner..
i cant bear the thought of him in love with someone else, be it guy or girl when we r together.. if ever he did, pls don let me find out.. b smart n do a clean job n destroy all evidences.. once i find out, i will jus say gd bye.. nvm hw much i used to love him, nvm hw much memories we used to have, nvm hw much time n $ spent together.. it will all b destroyed after the incident.. n so i had a terrible dream of seeing him with another girl, hands clasped, hugging etc.. i had chest pain n fainted in the dream when i saw them.. he tried to help me but i pushed him away n refused his help.. n i woke up with a chest pain.. m i thinking too much? i hope i m...... he's been nice so far, everything is well.. for the long journey ahead, we r working hard.. aza!