You live in Vegas.

Take him to UNLV Medical ER. They have a very competent Pediatric Center .

Hospitals have Social Services that can work with you to arrange for social services to pick up where services were 'dropped' by whatever fault.

That child is in need, and you need to obtain the best possible evaluation for him; as you know - you have been through this yourself.

Don't let 'what you can afford' hold back the care he needs now.

Go for it , SpaceCadet, you will feel all the better for it after all.