HELP!

Hi I'm 19 yrs old and I used to have pretty thick and full hair,and im trying to grow it long,but I have a natural wave and it always stopped me so i used a straighting iron on it everyday 2 or 3 times a day for bout 3 weeks and i quit bout 6 mts ago but ever since my hair has been thinning out alot and b4 i enver hardly ever lost hair when i brush it now i ntoice everytime i brush it i lose like 8-10 pieces of hair almost everytime and it it worrying me a great deal i've gone so nuts over this my doc has put me on paxil a anti depressant cuz ive been so worried about this.Is it possible ive caused permant damage and im now going to lose my hair?I dont ahve any balding in my family i dont think my dad's dad has a full head of hair but my moms dad was kinda bald am i in trouble?Please help me!!