Seek the wisdom of those with more years of life experience than you. Parents, mentors--professional or otherwise; people you respect.
Pray, meditate, listen to music. Go to whatever normally grounds you and restores peace. Breathing exercises are excellent for remaining grounded in the present.
Avoid emotional runaway -- stop to examine your thoughts, and feelings. Then the behavioral reactions the stress is provoking. Forces you to be less driven, more objective. Can reduce panic, and impulse decisions.
Make a decisional balance table. Make 2 columns, list the factual evidence FOR/ and AGAINST the worst case scenario you envision. Assess which side is weighted more heavily. Reevaluate your conviction that everything will go wrong.
Determine what the worst case scenario would be. Then how you would respond, both in feeling and actions. Rate each in severity, and your coping ability for each. List any and all resources you could call upon to assist you. Reevaluate worst case. Where's your coping ability sit now?
@SethGreene531 Thank you for this. I stress myself out too much. I don't have ways to cope. I usually goto sleep or go outside. I'm not tired and its over 105 outside right now. I would go for a drive but I'm in recovery from surgery so I would have a hard time with that