I think there's certainly something to the idea that if the festival is important to you, the process of attending does allow you to leave behind a lot of the emotional weight you've been carrying. I think perhaps it's that a week at Glastonbury allows you to 'reset' and escape the cycles you find yourself repeating in the real world.
A month and a half prior to the 2022 festival I had an operation to have my thyroid removed after they found cancer. I'd had the diagnosis in January, and I spent the first half of the year incredibly anxious about the entire thing - it would manifest itself in some weird ways, and I lost count of the number of days or evenings I lost to feeling overwhelmed by everything going on. Three or four times a week I felt like I was dying and there was nothing I could do.
I remember the Monday before the festival I was still feeling terrible, with me calling up a friend and crying over the phone about how I didn't want to feel how I had been while there. This was despite already having had the operation and being back to work, living my life like normal.
While at the festival, I ended up feeling the best I had all year, and getting home after the festival, everything seemed to lift and I was able to basically go back to a normal day-to-day without the feelings I'd had before. The whole thing could be coincidence, but I do honestly think the process of going to Glastonbury and just existing there for a few days helped me get past it.