Talk to Pediatrician on Psychiatric Issue Child

my son age 6 has suddenly become very hyper. Keeps weeping. All time he keeps asking strange questions either about old cricketers and their records their bios their statistics or other very old bios of grand father etc. He used to watch YouTube a lot and enjoyed but now all the time he's saying that all the episodes all the advertisements etc very old ones even get fixed in my memory, my brain gets stuck, I can't forget anything and he says that I remain in tension because all old memories etc occupy my mind. When we take him out for cycling or walk, again he fearfully looks at people and things and says that now I will not be able to forget these people. He's also very very deep into dates and numbers and remembers by heart very very old dates and numbers etc... He then complains about headache as well. But very mild headache. Due to adenoids and tonsills he couldn't sleep well during last 3 years at night. But from last few months he properly sleeps. He also asks about ages of old a