Will my hair grow back after being pulled out? No change in 4 months and very worried.

over 4 months ago i brushed out my dreads due to build up using crochet hook and conditioner. I was far too rough and pulled out so much hair, leaving a bald spot and all my hair feeling much thinner. I have started my dreads again but they are much thinner and there are no where near as many, at this point i would have hoped i could feel my dreads thickening at the roots as the new hair regrows but this is not the case. i am seriously worried i have permanently damaged my follciles and my hair