Community medical question

I have problem with my hairs till the age of 17 i had very long healthy shiny and beautiful hairs even everyone use to ask how u have so beautiful hairs and suddenly hairfall started and my hairs start loosing now it has been 3 years my hairs has become so thin even as they get little bit long they become thin from lower side now I cant have long hairs because as they get long little bit they become thin i have tried many oils bt they cant be like before i am very worried about this