Here's what I think. Every time someone experience something uncomfortable you have about 9 possible reactions. Each reaction requires more effort. You'll go for the one option that seems most likely to succeed with the lowest effort.
Every time your son experiences discomfort these are his option. If he gets around the 8th step a lot he will start showing symptoms of stress or depression. First we want him to avoid coming to that step. Second we want him to stay in the top 3 choices, because that enables him to prosper. So. If he can't ignore it and haven't prepared for it, he'll turn to you and try and make you fix it.
Sounds like he's trying to use YT to hide from it whatever bothers him because he's not prepared. My advice is that you prepare him for what ever worries him.