Banging my head against a brick wall

Ok deep breath, my son is almost 8, hes been in the system since around 3 years old, he had his 2.5 year check from health visitor at 3 she said he had developmental delay, we went to the docs who said he also needed to see Salt.

Since the age of around 6 months he rocked from side to side at every oppertunity, he still does this now, he always screamed in supermarkets and kicks off in them now, as soon as he could stand he would jump up and down and flap his hands which he still does when excited.

Hes never really played with toys only just lines them up, and was very repetitive in speech to the point it would drive you insane.

Anyway fast forward hes saw audiologist and hes got noise reduction hearing aids, saw a private Ot whos basically saying he has Spd.

Weve always had behaviour issues however now hes having full blown meltdowns that are very agressive and him saying he wants to kill himself and him trrying to harm himself at the same times, been to Cahms and they say hes low to moderate risk because im always there on top of him and that he needs an Asd assesment and Asd would explain his behaviour.

Senco has been off quite a lot, so pead has had no info from school, now senco is back and the peadatrician has gone off on maternity which could effectivley be a year that shes off, it is also in his notes that if his behaviour were to continue hed get a written diagnoses of Asd, went pead last week and basically been told his hands are tied as hes covering and his normal pead knows him better!

I had to go into school and show them not so long back what hed done to my arm, where hed bitten me and scratched the hell out of it and basically told them id had enough!

His teacher has basically said hes on the spectrum and hes like other children shes worked with that are on the spectrum but now shes left.

So where do i go from here? do we spend another year in limbo whilst his pead is on maternity? or is there actually anything i can do?