My wife is from CZ, and her family is concerned as well. However I will give you some helpful advice to reduce your anxiety. STOP reading the news. Of course, people will still talk about it around you but you don't have to focus on it.
I used to read the news daily, and I found it very triggering. The final straw was a news story about a toddler suffering a horrible death that triggered an awful depression for me. I deleted my news bookmarks, and I haven't looked at the news since. I swear my mood is much better after that decision.
What is going to happen, is going to happen. You can;t control the world's events, so might as well not worry about it too much.