I never really post, but since I have first hand experience, here goes...
I took Accutane for six months when I was a teenager and it was the best thing I could have done for my acne. After two years of trying everything in the book, Accutane cleared everything up and it has remained that way for the last 15 years. I have read all of the info about accutane being horrible, but like everything else, it just needs to be monitored while you are on it (ie, liver function tests while you are on it).
As for the lawsuits/suicides/depression link, you need to understand the demographic using the drug. What I mean is it is used by teenagers, and what teenager isn't depressed/suicidal at some point or another. Throw a bad case of acne on top of that and no wonder one could "link" accutane with suicide/depression.
I just wanted to let you know that for every accutane horror story you hear, there is another 1000 success stories. Whenever I go see my dermatologist, I am always so thankful to her for finally putting me on accutane. I am now 28 and have no regrets with accutane and I am sure when you look back you will feel the same.
As for insomnia/not growing, it sounds to me like you need to eat more, a lot more. I highly recommend you spend the next few years bulking up and working on basic programs like starting strength, etc and see what works for you (5 days a week is pretty intense at your training age and weight). I also was extremely skinny in highschool and didnt bulk up until college. You have the ability to get started younger, do not waste your time.
Stick with the big basic exercises(squat, deadlift, press, row)get in the gym lift hard and fast, get out of there and go home and eat, rest and recover. Drink a gallon of milk a day, utilize olive oil/oatmeal in shakes, eat a large meal 2.5 hours prior to training and another within 90 minutes after training.
Calories need to be at least 3000 per day, but at your age i wouldnt be suprised if you need at least 4000. I would not worry too much about the quality of the foods until you build 30 pounds of muscle. Keep protein high, I found that something magical happened at the 300 grams per day mark.
Read the articles on this site to determine a plan of action and then go out and execute. My only advice is to bulk up and get on a Basic beginner program.
Good luck to you and your goals!