Blinking eyes , very scare of unfamiliar faces/people, tantrum/attitude

I just found out on sunday night that whenever my son see cartoon on his phone, he will keep blinking his eyes like one hard blink then for a while again he do the same sometimes he doesnt have his screen times i let him play with his toys, he do it not as much as he have his screen times. Sometimes he bring my eyes to his eyes i think ask me rub his eyes for what i see and guess. Im trying to slowly cut down his screen times alrdy as i think maybe due to too much screen times it causes him have a hard blink. P. S. Usually screen times r like emergency solution only like example i need to bath and he doesnt need to bath again as he already had his bath before im home from work because when he see me bath he also want to bath he wants to play water. Or like i need to do urgent toilet business doesnt want him to come in to the toilet. when i let him have his toys to play with he will still want to come in to the toilet so screen times r usually my last emergency solution to distract him. Sometimes he want me to play with him but i was busy doing house work i will try talk and communicate with him to distract from disturbing my house duties. Like while i need to take out clothes from hanger he will take my hangar and play with it and throw everywhere or when i hanging clothes he will pull my shirts or pants to ask for carry. Now a days his been very clingy to me he met My mom after 1 years plus he also scare of my mom he cry cling to me attitude. But actually my mom didnt do anything.the very first time my mom carey him when he was a few months old.She was being friendly and nice to him. He now started get very scare if i leave him alone for a while with people he dont know or maybe not familiar with. He will cry damn, attituse/tantrum, saw me he will comw towards me hug me ans lay his head on my shoulder So i really have no idea what can i distract him with other then screen ttimes. sometimes he will go and take things from table or take his shoe anyhow throw everywhere if nothing can distract him other then the phone. As im alone looking after him morning send him sch evening my grandpa fetch him bck i end work ard evening sometimes night before 9pm then i reach my fam place to fetxh my son back. Because i wont leave my child at my fam place overnight as i know they wont be able to handle during the night coz they r quite old already So i really hope any very experienced older mommy at here can advice me or solution for me🙏🙏😔😔 All mommy do want their kids to grow up healthy. #advicepls #pleasehelp #firstmom #oneandonlychild