So i have been having night/sleep terrors..waking up screaming and yelling?

OK...for the past 4 years I have been waking up either screaming, yelling, fighting (kicking and punching) Or all the above. I never had this problem as an adolescent and my doctor said that I am having night mares. The more i read, the more i am convinced that THESE waking-up-in-the-middle-of-the-night-scr… ARE def not nightmares. But here's where i'm starting to get some leeway. I've finally remembered the last two times i woke up screaming and what it was about. the first was a ball of light fly really fast to my face..and I woke up screaming trying to climb the wall and eventually fell of the bed taking all the covers with me. He turned on the light and said I was sitting straight up. my eyes were open wider than he'd ever seen and said I had the look of the fear of God on my face. The second. Last night. was a fire. I thought there was a fire in my room and i guess i told my boyfriend to shut up and started to head towards the end of the bed, once again, taking all the covers with me. What does this mean.. Does it even have a meaning?? I've been trying to think long and hard. My boyfriend and I have a very healthy relationship. so I know it's nothing about us! What is going on?!?!