We're all different, so what makes us feel better when sad is different, too.
Crowds, restaurants, etc.? I'm not afraid. Never have been. I hate them, on a regular basis, but am not afraid of them. Best way to describe it is like a predator. Waiting. Watching. Wary. (Hilarious, ;) because I look like anything from a grinning soccer mom to a bubbly CoEd most of the time. Shrug. Old lessons die hard). I'm most at ease in crowds when I can use them. Disappear into them, weave my way through them, have an exacting mental map of them. To this end... When I'm doing well, I usually pause for a moment and evaluate the patterns. Where are the entrances & exits? Choke points? What's the vibe / What kind of energy is the crowd or place putting off?/ crowd's mood? In restaurants I usually make an excuse to use the rest room right away -often before sitting- so I have an excuse to walk through it & see around corners. Am happiest seated in the back, right near an exit, facing the front exit where I can see everyone coming & going. Easy way out & good field of view. Failing that, any corner. I really, really cannot stand people behind me. Unless I have a big fat mirror in front of me. There's a reason most cop bars have mirrors galore.
Most people don't notice my scanning, because instead of trying to stop it, I decided a loooooong time ago to simply run with it. Which means I usually get it out of the way quickly, and can be pretty discrete about it (like using the Ladies room even when I don't need to, to get a layout... Or looking for a place to smoke, even after I quit smoking. 2 things people understand / give me a reason to be wandering about or standing around doing nothing. As does photography. As do small children.)
When I'm with other jumpy people, one thing I've noticed a lot is that they try not to do it. I don't get that. Not look weird doing it? Sure. There are ways to be subtle. But fighting against doing it leads to some crazy stress / tension. Which sticks out & is noticeable. Which makes people look at you. Which ratchets up the stress/tension even higher. Before you know it, the whole vibe of the area around you has changed. Everything escalated. This is part of my dopey-girl act. Plaster on a grin, wander about like an idiot for a minute, and report back. Bathrooms on the right, kitchen left, possible exit through kitchens. Blocked rear exit, alarmed, frat getting stupid in the bar, ladies brunch upstairs. Wanna stay here, order to go, or head to the taco truck? Usually, after a few times of Friday-Survey (being pissed, waiting for me by the lobby), they join in and we can split the duties. And they relaaaaaax. Breathe. Tranquilo. If it's icky, there's always the taco truck. Other people just think I'm effing nuts, and can't stand that I go on walkabouts every time I'm in a public area. In & Out is their mission. Do what we came here to do. Well, I'd be 10,000 kinds of unhappy and stressed out not knowing the lay of the land. S'alright. To each their own.