Researchers are testing a new online therapy program to help adults with long COVID-19 manage their emotional and cognitive symptoms. Long COVID-19 is a condition that can cause persistent physical, mental, and emotional problems, but there's currently limited research on effective treatments. The study aims to see if this group-based therapy, called the Unified Protocol, can improve outcomes for people with long COVID-19. Participants will be randomly assigned to either receive the therapy or wait for treatment, and their progress will be tracked over several months. The researchers hope that those who receive the therapy will show greater improvements in emotional and cognitive symptoms, as well as changes in how their brains function and hormone levels.