Hello Brandi,
I'd like to help you out.
Let's see whether I can be any helpful.
I'm a teacher of English and teacher trainer/coach.
Something so positive, to be said first, is that you are very concerned about this student of yours. You do not atone him. You have affection to him and wish to really help him. That's a first fantastic premise. You want to do things good.
Maybe plan just a simple activity, no, better said, kind of a goal for him, on a regular day - Ok, it may be an activity. If he achieves this small job, praise him gently. Of course if he somehow strive to attain that goal but he doesn't achieve it, don't get desperate. Praise any effort by him. So, implement something small every day for him. He notices your affection and concern. You do good.
Keep cool. You are somewhat a new teacher, and experience is a key point that will produce advance. Because you will retain whatever works fine. So, step by step.
And keep on making the rest of the class-group working, of course. Maybe assign a monitor to him. Quite often many students like to help a classmate, because they appreciate your effort, and some of those kids will wish to give him a hand, to him and to you as well. Praise this help from their classmates, and if convenient, let your class-group know this student's progress, step by step. No step one day: tomorrow will turrn out better.
And try, as much as possible, to let a specialist to treat this kid. As soon as possible.
Though he doesn't understand you enough, your loving and endurance conducting will be noticed by him, for sure.
Best wishes.
Fernando M Díez Gallego
Granada (Spain)
Possible more tips on http://fernandoexperiences.blogspot.com , though it's mainly on TEFL, TESL, ELL.
Please if you read this message and be any helpful, I'd appreciate any signal you read it.
Carry on teaching him a few letters of the alphabet every day. Make him tell you the letters he learned last day. And you might learn some basic praise words or expressions.
Fernando M Díez Gallego