high functioning autism toddler how long did you wait?

I’m very desperate now.

I have been dealing with the challenging behaviour of my 33 month old now for over 12 months. I asked health visitor for help twice but was told to wait until he was 3yrs. 3 months after me raising concerns his behaviour becomes so very challenging that his nursery raises concerns too as he is harming staff as well as other children.

Health visitor finally comes to see his behaviour for herself and makes a referral. (Speech and language, hearing tests and educational doctor) I have waited 3 months now and heard nothing from the nhs.

Can I ask how long did you wait for a first appointment?

My son has recently started going to bed late and waking through the night (gone from 12 hours sleep to 6 hours sleep) which is making his behaviour all the more difficult.

i guess it’s maybe a postcode lottery?