I'm so at the end of my rope with my son. I don't know what to do

This is going to be a rant but I'm so frustrated right now and I don't know who to turn to. I feel like all I do is yell at my son (he'll be 5 in a month), and I feel like our relationship sucks. I hate it. I'm constantly conflicted with trying to not raise a brat and not being an asshole dad.First of all he's extremely high energy. We think maybe he has ADHD. He wants CONSTANT attention from his mom and I. He never just goes and plays on his own or with his brother. This morning he begged me to play in the sprinkler outside and I said he could as soon as I finished a couple things I was doing. He asked about 10 times before I finally got it out... and once I do he goes through it for 2 minutes and then comes up "will you get my squirt guns now? will you play tag with me? can we get out my bike?" and on and on and on. This all while his 2 year old brother just has a great time in the sprinkler and finds other things to keep himself busy. And, it's not like he doesn't get attention. Some days I'll go run around with him for 2 hours straight and as soon as I sit down it's asking to do 10 more things and he pouts like you never do anything with him as soon as you say no.He also just doesn't listen to anything we tell him to do. We were at a restaurant today meeting his grandma there and when he saw her coming he said "I'm going to scare her," and I said "hey we're at a restaurant, don't scream when she gets here" and he says ok, and 30 seconds later sure enough he SCREAMS at the top of his lungs. Also, earlier today his brother was trying to turn on a night light in his room and he was fighting with him telling him not to and I come in and say "leave your brother alone, he can turn on the light." He just keeps trying to drag his brother away and I say "just let him do it" about 3 times before I scream LEAVE HIM ALONE!! and then he stops.He also just doesn't appreciate anything lately. I know that's probably normal for kids his age but the constant pouting when he doesn't get his way is driving me nuts. He'll ask if he can have a candy bar at the store and then be mad that he can't have 2. It just feels like he's never happy.His brother is in the terrible 2's but is easier to handle right now. I'm just depressed lately because I feel like we have very few positive interactions right now and I hate that. via /r/Parenting https://ift.tt/2Tygbr7