Hair breakage :(?

without any research I was desperate enough to trust a woman who used the hot fusion method to apply extensions to my hair. It looked great at first, but the hair was incredibly heavy and would dry out in a matter of days. I had to continue to go back to the salon Anyway, I had them removed after a month of wear and was DEVASTATED by the results. My hair was twice as thin as it was before the application! I wore clip ins to disguise the damage. It is now over a year later and what has really seemed to help was a layered cut. However, the under layers are still very broken, short and somewhat sparse.I do not have any bald spots except some areas around my temples which are only noticible when my hair is greasy and pulled back tightly.I am currently taking gnc omega multivitamin for women (active) ultranourish hair and 1200 mg of extra biotin daily. I have began to apply doo grow to temple balm. Has anyone else been through this? What did you do? How long did it take for recovery?