I’m sorry to hear your pain isn’t getting better yet…I would make sure you have the correct cause of pain. Do you sit at a desk during the day or hold a phone to your ear a lot? The repetitive activity could be causing the pain as well as stress (we tend to hunch and tighten up our shoulders). If indeed you do have overused upper traps, there are a variety of scapular and neck exercises you can do to alleviate the pain. Correcting any postural or muscle imbalances may help as well.
IdeaFit has an article at www.ideafit.com/fitness-library/repetitive-stress-injury and another one at www.ideafit.com/fitness-library/trapezius-strain-upper-trapezius-pain.
Hopefully some of the information helps you. If these exercises and the ones your trainer has given you do not help, you should see a physician about your pain.