How are your diet and stress levels? Those can also contribute to dryness and brittleness, even if nothing shows up wrong on blood tests. Did they just order a general blood count and vitamins/minerals, or did they also order blood tests of various hormones? I ask because an imbalance in thyroid hormones is quite common and can easily affect hair quality, but it's not always ordered.
I wouldn't cut just yet. It sounds like you would have the same problem with hair in not great condition, but then it'll be shorter, too. Benign neglect outside of actually washing and conditioning it might be in order. If there's a way you can style it during the day that is gentle and hides your ends away from sight, that may be good for both your ends and your peace of mind. There's always those fake-bob hairstyling tools. That would protect your actual thin ends and make your "ends" look thicker while you figure out what's going on without actually having to cut anything off. A bunmaker might also be a good way to protect your ends while keeping them out of view. I'm thinking of this sort of thing:
https://www.ebay.com/itm/Womens-Bow-...K1wE6knR6PZw_g I've never tried it myself but it looks gentle enough.
Is there anything that could be sucking moisture from your hair? Are you using anything that is a humectant in dry weather? Do you have a satin sleep cap or pillowcase? I'm just tossing out ideas here of things that might help you troubleshoot. If oils are bad for your scalp, what about teas or aloe? Are your skin and scalp also dry, or do you have scalp oils, they're just not helping your hair?
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