Why is my hair thinning?

[emrose97]

I am a healthy 20 year old female. I am a former collegiate long-distance runner; I stopped running competitively a few months ago, but still run and workout regularly. I noticed that shortly after I started college (2 years ago), my hair stopped growing completely. It used to be long and thick, but over the past couple years it has become very thin and damaged and simply doesn't grow. In addition to this, I have also been getting acne on my jaw and neck-which I didn't use to get. It is difficult for me to pinpoint what could be causing this because a lot of things in my life changed when this issue started occurring. My diet changed, I lost a bit of weight(down to 6.4% body fat), my training intensified, and I started two medications for depression (Lexapro and Wellbutrin). I gained the weight back after I quit competitive running, but the hair thinning persists. Another thing to note, I have never been an illness-prone person, but lately I have been getting sick a lot and have had several infections over the past few months. I recently got my blood tested because I have mono(which has hit me hard), and aside from the mono and white blood cell count (low neutrophils and high lymphocytes-presumably from fighting off the mono), everything was normal. My ferritin and thyroid tests also came back normal. I have a regular period and healthy diet. I've tried researching Lexapro and Wellbutrin side effects, but didn't find much on hair loss associated with these medications. Any suggestions would be appreciated!