Happened to me last month. Very frustrating. Flew from Chicago to Helsinki via LHR. I was blaming London airport; turns out bag was not even loaded in ORD. Took 8 days for them to find it and contact me. I stupidly packed my regular medications in the suitcase, so I was without my medications for several days. Ended up buying basics in Helsinki and then more items when I arrived in Tokyo. Luckily I was staying in service apartments and had washer/dryer in my apartment. To top it all, I developed norovirus after I arrived in Finland.