Apple cider vinegar is acidic .. hard water for tap is alkaline.. hair prefare acidic pH so if you rins at end with diluted ACV in water it help to keep hair free from freez so less tangle less pull less hair loss.
In your case problem is internat
vitamin deficiency and
thyroid (hormonal imbalance) so ACV is less effective.. though you can try it.
But along with it start homoeopathic treatment to connect your nutrient and hormonal levels
Next Steps
you can consult me online.
medicine will be couriered to you.