I got the SAME exact way during the Boston marathon bombings. I had 6 hours of classes I was sitting in and the entire time I kept refreshing my phone on many of the updated news feeds. I thought the world was going to end, especially with that explosion that happened days later I think that was in Texas... Even though I think that was accidental. Honestly was about to go out and purchase all the ammunition in my town and go on straight lockdown with my best friend. I felt this horrid fear that we're getting trojan horse'd.
We have to realize the power of authority here, Syria battles are going on daily just as Ukraine but think about the support that was given to the United States by so many countries when 9/11 happened. A lot of those events are played out savagelike that would not effect much of the United States. Media takes a LOT of play in causing fear and concern for ideas, it boosts their views. sometimes (not all times) A lot of things that are documented aren't really what they're played out to be.
I'm sorry to hear that this is taking an effect on you, I've seen quite a few videos and articles on what's going on in Ukraine, but it's a different society with different political and social views. Contrary to popular belief, I feel that we are in good hands.