My TA lost my mideterm and it's worth 50% of my final grade?

My cl has 150+ students. My section has ~30 students. Everyone got their midterm back except for me and some other guy. I don't really have any friends in the cl so I can't really think of anyone who could vouch for me that I was there. And my professor never takes attendance. What can I do??? I'm freaking out!!!! HELP!