Btw, if your co-worker isn't understanding of your emotional position, don't worry about it. Someday, she'll be struggling with similar feelings herself.

Do you need to be more busy, to keep your mind active and stay away from the anxiety that you're fighting? Have you tried bringing a smooth rock or squishy ball with you to work, to distract yourself with as you fight these emotions? Focus as much as possible on the object's appearance, texture, etc to take your mind off things for a few minutes. That can really help a lot!!