Oh no

I'm not surprised you're freaking out - that must be so worrying. It is important that you try to find out who it is though, those meds could be very dangerous to someone else.
I always worry about mine being taken by one of my family by accident or curiosity - I'm pretty careful, but I know that if someone really wanted to, they could probably get to them. I probably need to think my med security through again and try to keep them more secure.
Hope you can get some peace and better times soon,
Bram.