You can search out a DAN (Defeat Autism Now) physician in your area, or nearby. That would be a start. Generation Rescue is also a good starting point. Good luck. Detox/chelation can be hard on the kidneys. Be very careful.
It can also be hard on your wallet.
Often those who shriek the loudest about greedy doctors and drug makers are at the forefront of looting money from desperate patients with useless and dangerous quack cures.