Hair fall and scars. Of the medications?

Hi, My name is Diksha, I am 24 year old unmarried girl. I had severe acne one year ago, then my doctor prescribed me accutane 10mg and monocyclin 50mg alternative day along with tretinoin cream. I was using these medications from last 1 year without any break. I have PCOD also , for that I am taking krimson35 also from last one year. I was on diet also to reduce my weight.I lost 9-10 kg in one year. now my acne has perfectly gone some scars are still there...but my face has become very glowing and my skin tone has completely changed..I complexion became fair now and my hyperpigmentation around mouth and forehead also gone. But  now I am facing hair fall problem..so my doctor asked me stop medication except krimson35 . now I am concerned about two things..1. after stopping accutane will my acne , dark colour, hyperpigmentation and bad skin texture will come back. although I am still using tretinoin cream . 2. why I am facing hair fall problem, is it because of the medications??