M.B.
You your thyroid is fine, but do you know whether they used the old lab ranges or the new lab ranges for TSH? And, did they also test Free T3 and Free T4, which are the usable circulating thyroid hormones. Also, did they check your ferritin levels? That can also be a cause of hair loss? And, yes, other hormones can impact this too, but the thyroid is the most common to be out of whack and it's extremely common for the auto-immune thyroid disease to be triggered by pregnancy/childbirth. Also, the Nexium can impact your ability to absorb nutrients, so you might consider whether that's absolutely necessary on a regular basis (I have that Rx also, but I use other things like ginger and DGL (deglycerized Licore root) to resolve the issue and only use the Nexium (or Prevacid) as a last resort).