Struggling with school, my sons attendence is so low

Hello all, i am new to this so please bare with me,

My son is autisic and since starting secondary school has not been able to cope.

He cant cope with a classroom full of other children, he feels embaressed about himself (he has tiks but not vocal)

The school at first were very understanding, gave him a part time timetable, but his attendence is still so low and his education is suffering. The school are now not communicating with us or understanding what he goes through, they just want him back full time and that is it.

Its getting to the stage where we are considering online schooling for him.

Has anyone else had such problems? Sorry for the long message but im really hoping to hear im not the only parent who is struggling right now.

Lauren