Setback are to be expected. That is the roller coaster ride of PCS. There are many triggers. Moderating those triggers can be beneficial. Loud music is a trigger for many. Minor bumps can be a trigger. Most trigger an anxiety based relapse so learning to moderate anxiety is a big plus. Setbacks will happen so accepting that uncomfortable situation is helpful.

For me, I would sometimes even need to plan on a setback after an activity I could not avoid or moderate. Those setbacks could last 2 weeks in the early days. I knew to avoid 'double booking' triggers. If I knew I was going to have to endure a triggering activity, I needed to do everything possible to avoid 'planned' triggers for the next week or so.

The hug and head bump type of triggers I learn to just shrug off. "Oh, that is probably going to cost me." Then I would move on. If it did trigger a setback, I tried to not let it cause anxiety because I was expecting it. I did not look for setbacks.

Many use anxiety to look for little changes and focus on those changes making the setbacks worse. I find that even though setbacks are annoying/frustrating, I can choose to keep going without focusing on the minor setback.

I hope this is making sense.

Try to remember to moderate your life rather than walking into a loud music/voices/noise situation and such. I always have foam earplugs at hand.