Don't let the other patient get to you. You are there to do your work while he is there to do his work. He is not there to diagnose/treat you. So, try not to let him get to you.
Keep trying to fight the feelings of worthlessness (I'm one to be talking. I used the word worthless while talking to T today.) It is just another lie that our minds like to tell us.
As for the dreams, learn what you can from it/them and keep plugging away.