Shedding hair at 26/ female...

[courtneyb1270]

I started noticing hair loss about 3 weeks ago, and didnt think much of it... Until i started pulling clumps of hair out while washing it in the shower. Then when brushing it i would lose even more hair in the brush and also noticed clumps coming out. i have noticed my hair loss underneath my pony tail,and that is the only spot that is really noticeable right now, but i can feel that my hair is thinning throughout the entire scalp. I have had numerous blood tests; testing my thyroid, CBC, Iron was a little low but i am not anemic, although my ferritin level was at 20. Which I think just may be my "normal" because back in 2007 i had my ferritin tested in a routine visit and it was at 21. And in 2007 i was NOT having any hair loss. Also had Vitamin D, and glucose tested. Everything came out normal, and my dr did mention that my ferritin wasn't even that low. I am so upset and scared that i am going to lose all of my hair if i dont figure out what is causing this. I am taking iron sulfate right now and fish oil. My dr has scheduled me for a patch skin sample, but that isn't until September. I am a 26 year old female. not pregnant btw, and my youngest is 3 years old. i never experienced any type of hair loss in the past, not during or after pregnancy. Any suggestions as to what could be going on? i would to love to hear from other people who have experienced this.