First of all ADHD is not diagnosed so early. Wait till 5-6 years to label him ADHD. Yes ASD should bother you. But heavy metals used in vaccinations do not cause either.
Next Steps
Kindly get a detailed evaluation done from a psychiatrist and a clinical psychologist.
Health Tips
Kindly have patience and don't hurry to diagnose. Don't trust the online information. Kindly get the clinical evaluation done first. Many options will be informed to you after the diagnosis and severity is ascertained.