I don't remember being hit by a truck, but I don't remember anything from about 5 minutes before until hours later. That was shock. The way I know it wasn't my fault is the testimony of witnesses.I'm with your mom. If you were driving & you don't know how it happened, it sounds like you weren't paying enough attention.
Falling when drunk is your fault for being that drunk.
Sounds harsh, use it as a learning experience in taking care of yourself. Be glad you're not dead, I know I am.