It sounds like the iron was too hot and your hair is now has heat damage. I suggest you try a PT and DT if you haven't already. Your hair might benefit from more protein now. That said, damage is permanent.
|| 3b; normal porosity; fine/normal texture || CG since Feb 2010 || SD prone & Propylene Glycol Sensitive

Current Routine BAQ henna 1/month Leave-in OH Hair Dew Cheapie Conditioner Tresemme Naturals Moisturizing
Old Stand-bys extra-virgin coconut oil Protein AO GPB; Moisture AO HR Style AOMMJ Kept for troubleshooting.
Waiting to try extra-wide curlformers SD treatment Neutrogena T-Sal; H&S Clinical Strength