Sensitivity issue. Why this happening.

Hi, I am 31 year old. i have some kind of sensitivity issues since i was 5 year old. i am not sure how to explain this, i have seen few doctors when i became adult, because my parents didn't understand it. no one understood. Few things makes me sensitive and my head and eyes kind hurt (not like painful), it makes me stress, unable to focus or do things. i still have those after marriage and child. for example, i can't wear glasses, after few minutes it gives some kind of sensitivity. some times i get weiredness in between toes or fingers. i can't scroll in phone a lot. even sometimes while writing pen gives sensitivity issue. and more, like itching so on. my discovered my head shaking automatically when i was stressed ( i found when i was 24 years old) i never had any medical problems, allergies or not even in medication. i get stress a lot now days because of this. someone tell me why this happening.