Massive hair and eyebrows loss after botox. What caused it, and how should I treat it? (Photo)

3 weeks ago I was treated with botox in my forehead and between the eyebrows. A few days later my eyebrows and hair started to fall out like crazy. In a week I lost more then 50% of my hair and it's still falling. The texture of my hair also changed, from thick and soft to thin and so fragile and the air keeps on breaking. Doctors say botox isn't connected to hair loss but I cannot point on any other cause that will make my body to react that way. Is it botox poisioning? How should I treat it?