When i try to leave the tomb it goes to the loading screen and doesn't get any further! I've tried everything i can think of to fix it, but no luck. Can anyone help?

Try making a new save, and then going to the dashboard and disable all the autosaves, clear out the cache, and limit your hard saves to six. Alot of the freezes and inifinite load screens are so to the autosaves. they seem to be "clashing." Hope that helps.

Tried everything you suggested with no luck. I've even tried redownloading all the DLCs reinstalling the game to my HDD. Now it seems to freeze on the load screen everytime.