The fear of the unknown

My son is 19months, shows all the signs and characteristics of autism, health professionals agree but cant give diagnosis until sees paediatrician. I already know he has it im just waiting for the diagnosis and my heart is broken. I cant help but blame myself and worry about his future! The not knowing what level or impact it will have on his future and my other child. Is this normal? I find myself crying so frequently right now, am I being silly/selfish? Its all very new to me and my husband, no one in either of our families are neurodivergent or autistic. Please be kind with your comments....