Hair falling out from the root from straightening it HELP!?

Okay so I have been straightening my hair for about 4-5 days a week for 2 years. My hair used to be super thick and it still is but I noticed lately that it has been falling out by the root. I am going to stop putting any heat on it. I am really scared that im going to go bald lol. Also is the joico k pak good for damaged hair. So leave any tips for damaged hair. And is my hair going to grow back im only 13.