Struggling to come to terms with sons diagnoses

My son was diagnosed with ASD nearly a month ago and I am still struggling to come to term with it. When I talk to people who arent close to me I end up in tears, I have had to tell my work and the school! My close family and friends are being really supportive but I feel angry and frustrated and guilty for feeling this way. Im not sure where to go from here. I struggle to talk to my husband as I dont want to upset him as I know that he like me is still coming to terms with the diagnose as well. Has anyone else felt this way?