I would suggest that you please immediately call the National Suicide Hotline at 800-273-8255 and your local counseling (psychologist) office. If one is not available today, please talk to a family member or friend that you trust. Stay with someone rather than staying alone.
Diet (what you eat) is not a symptom of depression. Though when people are depressed, they may not eat or overeat. Carbohydrates (desserts, sweets, and bread) will increase “feel good me” chemicals (endorphins) in the brain but are not a fix for depression.
There are not a lot of “healthy” food choices at fast food restaurants. Most people go to fast food places to get burgers and fries.
If on the other hand, you mean an efficient, quickly cooked menu, I would suggest you contact a Registered Dietitian where you live who can plan a healthy eating plan that includes the foods you like. Call your local out-patient clinic or hospital and ask to talk to a dietitian.