Urgent! Help needed

Hi! I was always an offline consumer of this sub. Today, i have a created a reddit account to get some help from this sub. I'm looking for a child psychologist/psychiatrist or anyone, who can help me in managing kid. My wife got a stroke last week and has been in hospital for treatment. She's recovering slowly. However, my kid(4 years old) has stopped eating food, not socializing with other kids and not having syrups as well. I understand that the incident has given him trauma. He's a hyper active kid who suddenly became silent and thinks about his mom. I have told him that his mom is recovering in hospital and he has to be strong to see his mom once she's recovered well but there's no effect of this. I tried taking him out, took him to restaurant for his favorite food and bought toys as well but all in vain I'm unable to figure out on how to go about this and his behavior worries me a lot. If there's anyone who can help me or provide some guidance, please let me know. Thanks in advance