Abnormal Venous Blood Gas test post panic attack

Hi All, Has anyone been tested for Venous blood Gas test in an ER setting post panic attack. Post my last panic attack when I went to ER they did ECG and Blood Gas test. ECG was normal but blood gas test showed elevated lactates. The ER doctor ignorer the reading and discharged me. On asking if retest is required he said no. Same thing was said by my PCP and Pshyshrist. But if I Google the same it shows a lot of scary things about elevated lactates. So need some reassurance here.