postpartum hair loss... when does it end?

Kara
My son is a little over 4 months and my hair just keeps coming out in clumps. I'm honestly afraid of going bald. I am not breastfeeding but I'm taking a multivitamin. When does this end. It's starting to scare me how much I'm losing. My ponytail is significantly thinner as well. Please help! I'm about to call the doctor to see if something is wrong. I'm a FTM if you couldn't tell.