questions - his complaining of things being too loud made me wonder about sensory issues. Especially if the class doesn't seem to be too loud to others. Have you ever considered this?
Can you figure out exactly what he hates so much about school -is it the loudness and being around the other kids who are being disruptive or is it something else? What is it about homeschooling that appeals to him - not being with the other children or getting to do more challenging work, or not being with his current teacher, etc? Maybe if you could pinpoint exactly what his complaints are, you can figure out what you need to do to to fix it.
No great help here, but maybe something to think about. I'm sure others will have some great advice for you.
I'm so sorry that he is so unhappy.
