I'm on anxiety medication and that helps me, if you are able to talk to your doctor. If you're already on this, try things like keeping notes, paper or phone. I use an app called ColorNote, very very helpful to me. Color organization, calendar planning, locks for security. Just a good way to stay stress free.
Stress is a part of everyone's life. What you're describing is either an anxiety disorder or a deep insecurity, perhaps from something that happened to you. At any rate, I think it's time you see a psychologist for therapy to see if you can get to wherever it is you want to get in your life.