Over time this will make you feel like a freak in a cave. You need to get outside once in a while. When you go into public with the intention of re-charging your emotional batteries, try not to put yourself into stressful situations. Money is an issue now due to the costs of the search, but don't discount your need to reduce stress. Two visits to McDonalds can be traded for one visit to a nice restaurant, late in the evening, when there won't be any children dining there.
Shopping is a major source of stress.
Malls and supermarkets are full of child-reminders. Ask your Guardian to do the shopping for you. Alternatively, shop at 7-Eleven late in the evening. Good luck with your search. May you soon be happily reunited with your beloved child.