Accounts merged?: Lost halo 5 progress

I recently downloaded halo 5 forge onto my computer and signed in with my microsoft account LastDinoicy12, everything worked fine except i did not have my actual halo 5 account/xbox account and progress (with all my stats and armor). So i signed into halo with my xbox account LastDinoicy10, however once i opened halo 5 forge my level and tag in the corner changed to the previous accounts character and so i checked on both my accounts and i now have no halo 5 progress, they are both on recruit with no unlocks and they both have the same halo 4 progress, someone please help i just want my halo 5 back. I think it merged my accounts and erased my progress with halo 5 because my old account was Dinoicy10 and now after this the name of my account has changed to Dinoicy10? please help…

i just searched for LastDinoicy10 and it says my account is still there with all my progress but i cannot access it anymore. please