Ok so I'm on korriban and I just fought darth sion, kriea interrupted and I left the battle now I'm right outside the sith academy (I can't get back in) and I die in like thirtyt seconds, no matter what I do I just die. Id get it is it a glitch? Plz if u know anything this is realing frustrating thanks.

Did you save in different slots?

Try reloading auto saves rather than using those manual save files for game. Might be that auto saves would bring you back to part of game way before glitch occurs, assuming that it happens only sometimes.