Poor kiddo!
OK, I sympathize greatly with the inability to make friends. Most kids in my grade were just making fun of me, rather than really wanting to be my friend. I spent most of my recesses in the library, or down helping in the special needs class. I had to get away from my own classmates. Is there any chance he could go somewhere else? Could the teacher let him bring some transformers to school that he could take outside during recess only? Or maybe a transformers coloring book? Reading book? Something familiar that he'll enjoy and can do alone? (You can't make the other kids stop being jerks, it doesn't work. But you can make it more comfortable to be alone.)
What works for my son on directions is taking the time to spell out what the directions are, and having him write them down as they're being spoken. Especially for visual learners, being able to refer to a written page of directions can make life much easier. (Which is also part of why schedules can be very useful for spectrum people. You can easily see what's coming next.)
I'm 32, and still struggle to follow multi step directions without assistance. Things like "clean the house" mean literally nothing to me. My husband has to break everything down into constituent parts ("put the clothes in the dirty hamper and then put trash in the trash can") or I get overwhelmed and shut down. Which is likely what's happening to him... the instructions get all garbled in the head and you can't remember what you were supposed to do next, so you shut down and do nothing instead.
So if the teacher can stop and say "first, we're going to do math, and you need to do page 35-37" (wait for him to write down "Math - page 35-37"), "then we're going to do English and we're going to read a poem" ("English - poem") etc... it might make life easier for him. He may need it broken down even more than that, but find out if she can take the few minutes with him to break it down. It makes all the difference in the world.
Like I said "clean the house" will have me sitting on the floor in the middle of the kitchen in tears with absolutely nothing done because I got overwhelmed and had no clue what to do. "Clean the counters and make sure all the dirty dishes are in the dishwasher" makes sense, and its something I can get done.
As for not writing well: laptop? Most autistics can type a lot better than they write. Any chance you can send a laptop to school? (That may have to wait till you have a diagnosis, but it's something to keep in mind.)
Earplugs save my life. Seriously. I can't stand loud noise, and absolutely cannot concentrate on... well... ANYTHING if it gets too noisy or too bright. And things that people think are inaudible are totally easy to hear. Flourescent lights are the biggy for me. Those things make such a loud, obnoxious, annoying, brain searing buzz/ring.
If you want him to have earplugs that are not so obvious (so he doesn't have yet another thing to be picked on for) you can look into musician's earplugs. They aren't cheap, but they're molded to the ear, have multiple decibel levels so you can change out how much you want to filter, and can be made clear so they are much harder to see. (Only downside? They look more like hearing aids than earplugs... so I've had people shout at me wearing mine, thinking I'm deaf. It totally negates the purpose of wearing earplugs if people then shout at you.) But they're really comfy and very useful. And again, can be worn without feeling like more of a freak.
Good luck to him! I hope you get your appointment soon!