Hi
Usually these things are not associated with any significant psychiatric or other psychological problems, so nothing much to worry, sleep walking is common in childhood, as one grows old into adolescent and adult mostly it will subsides, so that has nothing to do with your screaming on bed now.
Next Steps
u need to practice sleep hygiene, avoiding tea & other caffeinated drinks, taking lite meals in the dinner (there should be at least 3hrs between dinner & going to bed).
Health Tips
just practice sleep hygiene, go to bed by 9 or 9:30, I don't feel you have any serious issue.
thank you.