I have always suffered from mild depression and anxiety but my GAD has gotten way worse starting from the beginning of the pandemic and a lot of tragic events that happened to me and my family in the past couple of years.  
I \[35 F\] have been living abroad for the past 12 years.  I am now in therapy but I am finding it very difficult to manage days where I know my mom \[62\] and my sister \[38\] will go outside of town because I am so scared of car accidents (very frequent in my homeland because of bad streets and people driving bad). Starting from the pandemic and all the tragic events it is like my mind decided "ok, this is it, ANYTHING can happen now" "why should it not happen to you when bad stuff happen to people who never expected it?". It is like my imagination is being used for very pessimistic and tragic scenarios and I always expect the worst to happen.   
The therapy is being helpful and I am trying to do anything possible (sports, mindfulness, eating well, no alcohol, socializing with friends as I have a good social circle here) to keep the anxiety at bay but on those days where I know they go out of town with the car I just cannot help it and I go crazy. I am always on my phone to see if they tell me they have arrived (meanwhile they do not tell me when they leave so that I do not know the exact time and go crazy), I keep lots of tabs open on my browser where I constantly check live traffic and news in case something does happen. I cannot live like this and I know I cannot live without them, they are the most important people in my life. I refuse to take any type of psycho medication other than natural ones but they are of little help on those days where my only reassurance is to know that my mom or my sister are safe and have not had an accident. I cannot keep living like this, what can I do? The worst scenarios come to my mind I am especially scared that I am in another country and that I could not reach them straight away if something was to happen. I have tried rationalizing everything but on those specific moments it does not help at all.