If your still having symptoms, and your GP is not listening
then Dr. probably isn't doing the job. So YES, I would ask to see Endo.
Keep in mind that Endo's can be NUMBERS crunchers
, therefore getting you INTO range & thinking they are D O N E while you're still complaining about SYMPTOMS. Some patients have good luck with Doctor of Osteopathic Med (one w/ D.O. after their name) lucky me has had a less than favorable experience with one of them too