It does sound like you are dealing with the terrible twos. Reading your post it also sounds like you are his only companion? And you are together most of the time?
For one, they do have their screamy screamy times. Ours are usually in the morning just after their breakfast and also in the late afternoons. Sometimes they can go for what seems like an hour. If you've been reacting to this by providing attention, he's probably learned very well how to get your attention, especially if you're his only company. I always recommend ear plugs to those who have issues dealing with the noise. It helped me bring the sanity back on board and they can scream their damn heads off if they want. I have to sleep with ear plugs so I always have a set handy somewhere.
Also, I work from home for now. I HAVE to boot them out into their aviary as I can't get a dang thing done when they are in here AND fidgety. My females Grey gets into everything, non-stop, unless she just feels like preening her pretty self (please please). I try to keep my birds in pairs or trios so they always have company besides ME. I can only take them in large doses, not 24/7 haahaa.