Try to have solution oriented approach, think of ways to manage the problem. If it seems a complex problem to you then break it into smaller parts and then solve it step by step.
Try finding out what triggers and then work towards by taking baby steps
Will stressing about it bring a change? No, right? Then think about the brighter aspect. If you're worried about weight gain, think of the possible solutions. Like exercise, yoga, diet change. If you're stressed about studies, then start studying. Make a schedule and stick to it. This way, you'll have found a way to deal with your problems and you're likely to not stress out