Hi Anjuluh 76...
My heart goes out to your son, and to you as well. I remember like it was yesterday the frustrations and difficulties of middle school. It's a tough time for anyone, but for a kid on the spectrum - (and their parents) it can be pure hell.
Hopefully, you'll get good support form the school - sometimes though, this does not always happen. Depending on the training and attitude of the professionals in your school system, your son may be shunted off with an IEP that does not fit his needs, but is what the diagnostician or the system wants. Also, depending your son's level of self awareness and insight, he may also benefit from good social counseling and social skills building - learning to recognize the subtle signals his body will send when he's 'had it'' with something or someone, and how to handle these issues...but mostly it's just time and growing up and growing inside as well that helps.
And one last note - not everyone who claims to be an expert is an expert. Use your common sense when it comes to recommendations about drugs and various other radical treatments for behavior that is merely unique, perhaps annoying, but not dangerous. AS kids really do hear a different drummer and they are going to march to that beat! Be prepared to help your son cope with a diagnosis that might make him feel even more 'out of it' for a while...Just make sure he learns to focus on his personal strengths and the gifts, learning how to compensate rather than see himself as disabled, or merely learning to cope with what a lot of NTs feel are disfunctions
Last but not least...perhaps most important of all - he is still the same kid he was before you got a diagnosis - bright, funny, articulate and on the path to becoming a self aware adult.