I went through years of hair shedding and finally found out i had anemia and then later found out i had a thyroid condition called Hashimoto's. I have battled for two years to get my ferretin up to 61. Low ferretin or difficult to raise ferretin appears to go hand in hand with thyroid issues. I was also found to be very low in vitamin D and iodine. Has your doctor checked those levels?
I once went on an iodine supplement for a few months and later down the track i experience zero hair loss for a whole month. It then began shedding again and i couldn't understand why. It wasn't until i had further tests done with my thyroid doctor that we found out that my body can't retain iodine. I've been back on iodine drops for about 2 months now and my hair 'appears' to be getting better again.
I visited a Trichologist for my hair shedding, prior to getting diagnosed with Hashimoto's and he did say that low ferretin and thyroid problems can lead to early onset of alopecia in females. Once everything is corrected your hair should get back to normal or closer to normal than what you are experiencing now.
If your ferretin is 13 still now, that is way too low. I'm up to 61 and my previous and current doctors want me at around 125 or at least at 100. It's such hard work. I can't miss a day of taking my iron supplement. You should visit the anemia board and you will get lots of tips and help with ferretin issues. The thyroid board is a great place for additional thyroid help. It has helped me a lot, but it's a difficult topic to learn about, but i'm getting there slowly.
With your thyroid, how long have you been on medication? That can have a bearing too. Your system might need to get used to the medication. If the medication dosage is too low or too high, that can affect your hair getting back to normal too. Some people who have been on only T4 med's have found it beneficial to be on a combo of T4 and T3.
I have also read that a lot of people find evening primrose oil to be a great help. ( removed )
I hope you get some answers soon, but i'd advise you to check out the thyroid board and post a thread on there with your latest results and there are some experts on there who will help you out and maybe give some tips. Take care