I am asking since my bf of 6 months has ADHD.
Sometimes it's hard for me to make the difference whether its his ADHD or his personality.
Any help would be greatly appreciated 
Racing thoughts. which can lead to difficulty sleeping. so he may be moody. people with add or adhd sometimes have trouble saying whatever is on their mind. they can become very anxious and depressed easily.
i have ADHD not yelling or ne thing but its a disorder not a disease lol. but um i cant concentrate i dont have very much trouble sleeping and i wouldnt say im racist but the other two points rita mentioned du play a role in my liffe but i had no idea it was because of my adhd so i thank her for that and yu for posting the question.
Attention-deficit hyperactivity disorder (ADHD) is a problem related to brain development that causes hyperactivity, impulsive behavior, and attention problems.
Following are causes of ADHD
1. Genetic factors
2. History of head injury
3. Infections of the brain and spinal cord
4. Premature birth
5. Exposure to tobacco, alcohol or other drugs while in the womb
6. Lead poisoning
Please go through my referenced website, I think it would be more helpful for your problem.