I feel for you on this. My husband has combat PTSD and it's been REALLY hard for him to handle a day in the parks lately. He doesn't have
DAS for himself, because we have it for our son, but he absolutely WILL NOT get into a standby line with us anymore (my son can handle some lines just fine). The biggest issue nowadays is that the standby wait times are NOT accurate. They are sometimes shorter but more often lately, longer than advertised.
We had a bad situation in the line for Small World at DL, of all rides. It said 15 minutes. It ended up being 45 because I guess the ride had broken down earlier and TONS of people kept coming through the LL line and we didn't move forever. We were trapped in the middle of a switchback and my husband was spiraling out. There was no easy way for him to get out of the line either. He had to put on a podcast and stare at the ground to get through it.
Just last weekend, we used DAS for Webslingers and were in the loading chute when the ride broke down, but they didn't clear the queue or make an announcement or anything. So we were stuck standing in this warm, stuffy hallway for over 15 minutes. We eventually did jump the railings and leave, because we had no idea what was happening and they made no announcement or anything. It was very frustrating. This was on Sunday and as of yesterday, my husband was still "off" from that one experience. It triggered him badly.
My husband is okay with talking about his struggles in general, but he isn't good at explaining what happens to him in crowded lines very well, so I'm not sure how well it would go for him to get his own DAS. He tends to put a dry, comedic spin on things and would probably say something like "I try not to kill other guests" rather than "I spend the time in line paranoid that another guest will suddenly attack me, and I plan how I would fight back, and what move I would use to neutralize them." This is literally what goes through his head while in a crowd that he is in the middle of that he can't easily move away from. I feel like that explanation could get his annual pass revoked and have him put on a trespass list or something. So, he doesn't want to talk about what happens in his mind when he gets triggered.

And it seems like the cast members are getting more invasive in their questioning lately. I am almost ready to write Disney an email about it, honestly.