Holy smoke Lars, words can barely describe such utter madness... There are indeed some unscrupulous MF'ers in this world.
Firstly, secure what belongings you do have and catalog any damage with photos and witnesses.
Secondly, review your lease / rental agreements with a lawyer, "Mieterbund / Mieterverein" or Danish equivalent thereof. (I had a similar, though less destructive issue with a dodgy landlord that decided to keep my 3 month damage deposit...and did so to everyone as I found out later. The local German Mieterbund, with whom I had a membership, got me my deposit refunded in full. It took many months)
Thirdly, bikers don't let bikers get screwed. Do you have any full patch, two-wheeled, bad MF'ing friends? (I'm only half joking...probably a bad idea but they might be great "middlemen")
Fourthly, counter-sue the SOB for property theft and property damage and look for an out of court settlement of "you give me my property back and I'll drop the suit" (no, I'm not a lawyer, just an idea).
Lastly, start applying for a green card for the USA or permanent residence for Canada...
Jeez, what on earth got into your landlord's head whilst you were away?
Lars, I'm truly sorry to hear this devastating news. I wish you good luck with sorting it out. Man, I feel for you.
Best regards,
Jim