My hair is falling out?!

This question is for the ladies! (or men) who struggle with thin hair and fall outs . Any recommendations to prevent your hair from falling out?! My hair has been feeling so dead for the past few months, I do apply oil to my hair and I didn't really see a huge difference. I used to have very long and thick hair which would go past my hips. That was when my mother used to look after it.... Now my hair is so lifeless and dead! I need help. I did visit my GP and did get a shampoo which I have used. It's just not enough to fix the damage.