Sometimes it helps to just think about something else. Are you currently confined? Are you able to go out for a coffee, go to the pictures, visit some family. Take a moment to engage with life today rather than thinking about the what ifs.
Anxiety is in incredibly uncomfortable to experience but episodes of panic will pass. Distraction techniques like engaging your mind in something else can be incredibly helpful and then relaxation techniques after will then often help.
Utilising phone apps such as "calm" "mineshift" or "smiling minds" that talk through body relaxation tools can help as it can be difficult to do it by yourself when feeling stressed.