19 with extreme hair loss help!

Alright so I’m 19 years old gonna be 20 next year I had my daughter over a year ago and I’m losing extreme amounts of hair like wads of it multiple times a day I only wash my hair every other day or else it tends to fall out more the only shampoo and conditioner I can use without losing TONS of hair is the Garnier Fructis curl nourish. I don’t use hair brushes because I lose a ton of hair so I brush through it with a comb or my fingers in the morning and I order to get any bad knots out I brush through it with my hands while rinsing my conditioner out so it all comes out easy no tugging nothing and I air dry by patting it dry then leaving it down or in a bun if I’m going out. But anyways the past week I’ve had HUGE amounts of hair loss and I’ve kept my same routine I have no idea what to do I thought about collagen vitamins but idk what’s a good brand or anything please help.