sorry your having problems but and i might be talking through my hat but mango needs 14 to 15 hrs sleep ok thats # 1 also he was quite noisy
for a long time im talking months came to find out it was the TV he hates it and its the only one i have its same age as he is,,lol
so if not TV how about RADIO try turning them off when he starts his screaming , but increase his sleeping , Mango gets upset if i get him up much befor 15 hrs mind you hes out of cage rest of time . if your guy dosnt play try corn on cob as a toy,, take most of corn off ..lol
funny how silly things work also a babys rattle they like toys that make noise , Boggie loved baby toys second hand stores are great for that
hope i have been able to help a little , cause living in an apt i couldnt have Mango screaming like yours at least not this one,,lol seniors want QUIETTTTTTTTTTTT im told..lol
gl hun god willing you will get peace im sure