Screaming or howling

I just want to apologize in advanced if you struggle to read this as i am dyslexic and i struggle to spell properly. I Am eighteen and i have suffered with the same horific dream since i was around 14. At the start i believed it was just an average nightmare but later on my dream became more repetatve and i had it around 2-3 times a week i believe. It has stopped for around a year but the past 2 months its became common again. My dream has not changed in the slightest and is exactly the same. I Have done research but i have no explanation for what causes my dreams. The start of my dreams is i am walking through a forest and a girl is hanging from a tree by her neck and then when i look behind her there are hundrends of people hanging, asking me to join them. Its only for that sort period of time because i wake up screaming. I Have even woke my boyfriend up being in floods of tears screaming and wriggling. Last nights dream was the strangest because it was exactly the same but this time in my dream i was dreaming of the hanging people. It is hard to expailn but i was basically dreaming another dream. I thought i woke up in the night and woke my boyfriend up crying but i actually did not and i was dreaming it. It was not untill this morning when we realised that i had not actually woken up and i realised that was dreaming it. My dreams have led me to actaully become ill and when i was younger i had thoughts of this happening. I belive that there is a reason behind my dream but i am worried that it could be psychological rather then a night terror. Can someone who knows someone or has dreams like mine or slightly lke mine please talk to me about it. I Have never been so ashamed and worried about these dreams but they are becoming more common. Sorry about the awful spelling i did try my best. Thank you, Harley x