13 Year Old Hit By Car

My boy was hit by a car crossing the street to go to school this morning He underwent emergency surgery due to bleeding in the brain and 2 fractures in his skull. After the surgery he was moved to ICU. Since his time in ICU they have not been able to stabilize him. We hope to get help with the medical bills as well as help with other expenses that incur while he is hospitalized. I am a single mother of 2 kids and any help would be appreciated. Prior to all this he was an active boy involved in all kinds of sports such as football, basketball, etc. Thank you in advance for any and all your help.