Talk to Gastroenterologist on SEVERE CONSTIPATION

SIR ,I AM DIABATIC PATIENT FROM 8 YEARS, MY BLOOD SUGAR LAVEL IS ON AVERAGE IN FASTING 120 MG, AND RANDOM SUGAR IS ON AN AVERAGE 210 TO 220, I AM TAKING MEDICINE FOR SUGAR BEFORE MEAL AMRYL 2MG, AND AFTER MEAL TREVIA MET 50/500 (SITAGLIPTION+METFORMIN+HCL) I AM SUFFRING FROM SEVERE CONSTIPATION,SOME TIME STOOL PASSED EASILY ,SOME TIME STOOL PASSED TAKE A LOT OF TIME . CURRENTLY STOOL IS NOT PASSING, TODAY IN MORNING AFTER A BEST FORCELY EFFORT FIRST COME BLOOD THEN A LITTLE BIT STOOL PASSED. PLZ SUGEST ME WHAT I DO NOW, SUGGEST ME A TESTS AND MEDICINE. THANKS