Help... is it normal? (Beware: Picture)

My hair is not so long, only 30cm in length. I had longer before up to my waist, but i cut it shorter after giving birth 3 years ago.

I know ppl lose their hair everyday, but everytime i wash my hair (once every 3 days), i can lose 3-4 hand full... i dont take any meds but i feel as if i am in chemo... is this amount normal? Or there is something wrong?