If I’m in panic mode, I focus on being fully present without thoughts. So if I’m home, I might start to clean, or make tea or just any activity that I can wholly focus on without thinking about what I’m doing. When I’m not in a panic, deep breathing usually helps. I try to meditate throughout the week when I’m not anxious to help with practicing staying present when the panic and anxiety does come.
You seem like you’re already doing everything you can to treat your symptoms. As Kolanaki said, there is no cure for the common cold. I’d continue getting as much rest as you can before your vacation. My colds usually take atleast 7-10 days to fully go away and that’s with proper rest. Sometimes I’ve gotten lucky and only had symptoms for a few days. If you have a sore throat, throat coat tea helps as well.