Suspicion of theft

Hi, i was travelling at Stockholm few days ago and left my bag at my hostel bed for few minutes for going to shower because the locker was broken. I realised just now little of my money is gone in my purse. I am afraid of theft. And im not in the Sweden right now.

Losing money is ok.. but i am also afraid of my passport and credit card infos.

Did you ever had this kind of experience? Can you give guidance? Thanks.