First of all you need to find out what is causing you problems.
Here's a nice exercise that usually works, get a pen and paper and just write down a stream of consciousness, just write down whatever comes to mind when thinking about stress. Don't worry if it doesn't make sense, don't worry about spelling errors and don't worry about secrecy, you won't show this to anyone, but just write down whatever comes to mind and don't stop and think, just keep writing. It usually helps you to understand what the whole problem is, then you can find more appropriate ways to find out what's wrong