Wow! I hope you're ok! I don't know about Norway, but in the US bikes are not supposed to be on the sidewalk -- they are vehicles and you can be ticketed for riding on the sidewalk. (Not that it ever happens, but I have a neighbor who made a stink about kids riding on the sidewalk in front of her house, and the police said it is true that bikes are not supposed to ride there.) So, you are right, you can't really ride your bike anywhere safely or within the law.
Sounds like drivers in Norway need to be educated about bikes just as badly as drivers in the US.
I do wish you had gotten yourself checked by a doctor, though. It's always better to be safe than sorry.
Louise
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"You don't really ever have to fall. But kissing the ground is good because you learn you're not going to die if it happens."
-- Jacquie "Alice B. Toeclips" Phelan, former U.S. national champion cyclist