High fever and chickenpox can cause hair loss? How many months it takes to recover the hair?

I'm 26 yrs old male.on April i got high fever by July may hair starts to fall out and thinning all over my scalp even the both side of my head near the ear. I've lost almost 30 to 40% of my hair.. and by October 2016 i got chickenpox, is that another reason why my hair continue to fall until now ?? January 2017. However i have seen many regrowth alone my forehead. Thank you for response.