Challenges getting bigger with 8 year old ASD

Hey I have a 8 year old son Diagnosed at the age of 3 with ASD I’m just finding things more challenging new things come up he has a tick now where he clicks his tounge, he seems to with draw in himself even more bed time is becoming a real real nightmare just draining quite frankly the frustration from him at night is pretty bad his starts calling himself stupid and clinging his fists pacing around the living room in bed out of bed and it goes on until I find a place his happy laying down any tips for bed time at all!??!! Please! Would be so greatful