Slowpoke, go see a doctor asap!
because the accident was not your fault, you can get all the money back on what it cost you. Also you can get compensation, depending on your injuries etc...
best to contact your girlfriends insurance company and explain what happen and they will be to tell you what to do. Also if you havn't made a police report i suggest you go and do one.
Basically if your unsure about anything go see and doctor and if your unsure about what you can get from the accident in terms of payments contact the insurance company
hoper everything works out