I apologize for the delay. I was away form my computer.
As for the focus, hang in there. There is hope! It doesn't appear you are a pill seeker. You just need help focusing. I think maybe you need a second opinion, maybe from a psychiatrist.
I have learned to adapt. I schedule distractions. Maybe doodle during class or do my grocery list or budget while listening to the lecture. I also tried to never take a class where the instructor did not follow a book so I could catch what I Missed.
At home I would do maybe two[assignments at a time. or maybe clean house while studying. Just make sure it is balanced with study and conducive.
As soon as you can though see a doctor about sine meds. In the mean time maybe drink plenty of caffeine. Also eat sours. They stimulate your thoughts.
As for the biting, firstly, see a pediatric dentist and out if there is a dental reason as suggested above. Secondly try these steps
1) Communicate that it is wrong in a clear manner in which a 2 year old can understand. Let the child know it is wrong repeatedly.
2) Any time she bites or attempts to put her in time out for 2-3 minutes and make sure she knows why.
3) Be consistent. Do not relent. In time she will learn
Does that make sense. If not let me know. I want to help.