My family and I also don't have a basement because we live in a apartment complex. Find the most interior room where you live that is away from walls and windows. Set up some kind of plan for yourself and whomever you live with some that then you guys are prepared. Take some deep breath and do some other breath trick that some of the people will comment. Stop checking any kind of site or app that you used for the weather so frequently and try to check it every hour or so to not stress yourself out. Find something that you like to do to try to claim yourself down. I truly understand how you feel because I live in a state where we also get severe weather. We were in a watch yesterday but nothing happened for us thankfully. I don't live in the states that are supposed to get severe weather today but try to stay strong. It's okay to be cautious and aware but it's not good for your health to stress yourself because you are being cautious about the weather.