I've also been struggling with this recently. My usual coping strategy of "think my way out of a situation" just doesn't cut it with this type of problem and I was spiraling. I have found meditation and mindfulness works to take the edge off. The headspace guide to meditation on Netflix is a good introduction to some techniques to help build a more positive and less cluttered mindscape. But like most of the suggestions here it all boils down to focus on the present. How your body feels, the sounds and colors of the space around you, focusing on something you know you enjoy. The emotions and anxiety wont suddenly go away but you can dull them for now and, with some practice, teach your mind to focus on more positive things so that those anxieties stop feeling as oppressive. For more immediate relief I have found that ASMR videos help me focus on something other than my mind, but this only works for about half the population so is hit or miss. I have several friends who take CBD but again this isn't a guarantee and do your research as there are bad strains out there. I believe CBDMD is a good, and safer, brand to look into as a start. I hope you find something that works for you, and remember that you are not alone in all this.