I tend to have focus issues at work myself. I am lucky however because I am not "tied" to my desk. I can get up and walk around any time I want to, and I know from past experience that generally a customer service rep is required to be available at all times and only has breaks to get up and move around.

What has helped me when I get really distracted is walking, I get up walk to the break room to top off my coffee, maybe a quick walk outside depending on weather. It helps me get the distracting thoughts out of my mind and be able to force myself to concentrate on what I have to do.

During your lunch break and other breaks, what do you do? If you don't already, try to walk. Have you tried grounding or relaxation techniques?

Additionally, time of day. Do you tend to be less prone to distractions at different times of day? Is there a possibility of working a different shift, and possibly even for a different supervisor?