Non-specific t wave abnormality: borderline ecg. after blood work and chest x ray, hospital said it was just anxiety. should i be concerned?

Given the vague description of the test findings no reasoned answer is possible. Only those with your full history/exam and test findings have the basic data needed to give advice on your case. If you want a second opinion go get evaluated,

Follow up with your primary care doc should help in putting the puzzle pieces together. The hospital did their part in ruling out life threatening conditions, more work is now needed in order to proceed with treatment in case needed.