I am in a lot of pain from last 4 years.

From last 3 to 4 years i am suffering from headache, my eye sight decreases in 2018 to some extent like (.5) in both eyes so i got my glass and starts to use tham but  after that whenever i was trying to wear my galsses it cause pain whenever the sticks of glasses touches my head like over ears and some back side pain starts slowly slowly than increases gradually. I visited 25 to 30 doctors from opthomologist, neurologist, phychiatrist but they all give medicine and the pain never ends and i use the lightest glassses available in the market and i do not have any eye related issues but whenever i use glasses pain starts where the glass touches my head like over ear than spread but when i remove it, it decreases. I have to use glasses because i am a student and i have to study for 6-8 hours to protect my vision i have to use these glasses but at that time when i am suffering from pain and do not get the answers of why it causes pain i think that medical science also have some limitation.