My husband is also a combat vet with severe PTSD, and LOVES
Disneyland. Crowds tend to freak out my husband, especially if people start pressing up against him. This usually becomes an issue if we are waiting in line for a ride. It’s usually just my daughter and I with him and we always try to make a “buffer zone” of space between the people in front of us and the people behind us, but there has been a couple times when he has nearly had a panic attack when we’ve been stuck behind and in front of people that have no concept of personal space and continuously pressed against us. I’ve found that just politely asking for space usually works, but there’s been times when we’ve just had to get out of line. He also likes to carry a backpack. It’s like a security blanket for him and also helps create space between him and other people.
The fireworks are fine with my husband if he can see them and we aren’t in a space with people pressed up against us. We sat at a table outside a restaurant in SWGE last time and decided that was the ideal place for him. He has issues with the Fantasmic shows sometimes. Again, if he can see it, it’s fine. If we aren’t planning to watch Fantasmic, we try to be on the opposite end of the park or gone all together. Be aware that a MASSIVE amount of people leave the parks all at once after the fireworks. We happened to be trying to enter when everyone was leaving. My husband panicked and made a beeline for the guest services building at the front of the park. They let us sit in there until the crowd had dissipated.
Also, be aware that they shoot cap guns on the Jungle Cruise ride. You can hear the gun shots if you are near the ride.
People above already mentioned some great quiet places that we’ve utilized in the past when we all need a break.