why am i facing these problems

from i was 14 and am 21 now i have being faceing a lot problem like plenty headache,problem getting to sleep.tiredness,chronic nasal congestion ,my mind always chating away,always seem worried, and for me to think and remember stuff i have to be shaking,moving some part of me.i cant be focus my mind always going a stray, get plenty of pop up thoughts,i dont socialize with people that much always staying in. and like for example when am going to make a conversation i always like thinking what to say over and over before a really say what i want to say,anxious feeling,get hangry very easily, i went to doctor many time do brain scan blood test all sort of test and they cant find the problem but i know to my self something is wrong,so i ask here if any one got any advice for me,