Dream of boyfriend, building, crowd, woke up

I'm at a big club-type party with my best friend K. The party is an event that's going through town, not one of the local clubs. It's in a western-style building with an L-shaped staircase. Most of the party is on the main level, I don't go upstairs. A dark-haired man catches my eye through a crowd. Later, that same man has me pinned to the floor and is attacking me violently. I'm terrified and confused, as I don't understand the reason for the attack but I know it's me specifically he's after. Later, I'm walking up a large, broad, off-white marble staircase with K, leading to a patio-type area on the front of a building. It reminds me of something I've seen in movies, there's definitely nothing like it in the city where I live. On the patio area there are tables, also off-white marble. We are going to an art class, and I am looking forward to it. There is modeling clay on the tables, but we have cameras and are going off to take photos. I have my ex- boyfriend 's camera (that I used to borrow when he got a better one and was teaching me photography). He is there and sees me with the camera, but we don't interact. Later, I go back to where the party was with K to look for clues, possibly as to a reason for the attack. I'm feeling traumatised. I'm terrified and upset and wondering if I will ever feel normal again after being attacked. I recall wondering if it's anything like what my friend felt after being sexually assaulted. At some point as we look around the club, I am descending the L-shaped staircase after finding nothing upstairs. We go into a small room to look around. The room is well-lit with natural light and is all painted off-white. There is a table in the middle. The room is familiar somehow. As we're looking through the room, the teacher from our art class walks by. We don't think anything of it until we go to leave the room and find that the door is locked from the outside. It's an old door, painted off-white like the rest of the room. The top half of the door contains a large, undivided window. A boy about our age who has been in the room the whole time but only comes to my attention now breaks the window and suggests we climb out through it. Only the lower half of the window breaks. K looks at him like he's stupid, reaches through the broken window and unlocks the door. I woke up shaking violently and afraid to go back to sleep. All through the dream I was terrified and felt like I was in danger. Extreme paranoia throughout.