If you have PTSD going out to eat is a big step and would be recommended treatment.JMO
That's quite strange to me since eating at home is much, MUCH cheaper and far more convenient. I would think that going to the market to buy food to cook for breakfast would be similarly therapeutic and way less expensive. So would be going to the library or the post office. Or even walking down the street in your neighborhood. Eating in a restaurant is never a necessity and there are plenty of ways to interact with people without going to a restaurant.