There are some steps you can take to lessen anxiety. These include identification of the allergen and possible sources where it might be found and careful education of the child concerning what to avoid and how to seek help if a reaction begins. Also, epinephrine and oral antihistamines should be readily available at home, in school, at day care, grandparents home, etc. People at those locations must be warned about the allergy and its potential danger. Provide written instructions concerning what to avoid, what to look for in the event of a problem, and specific steps to be taken at the time of a reaction.
Some parents feel better carrying a beeper so they can be reached quickly.
The child's asthma must be kept under control. If anxiety is bothersome, counseling and support groups are a good idea. The American Lung Association can put you in touch with help in your area. I would also suggest joining the Food Allergy Network . I hope these comments are helpful.