Excessive Hair Shedding - Looking for Suggestions

I'm new here, trying to find suggestions for the excessive hair shedding I've been experiencing. I don't have patchy hair but there is one area that, once thought was a genetic hairline, that is is lighter than the rest. I know it may be related to a combination of gluten sensitivity, mild hypothyroidism, and stress but what are you doing to combat any similarities you've experienced. I eat well, exercise often, and am not currently taking any medications so hoping any suggestions or stories you have to offer.