I have seen people recommend a mouth guard from a sporting goods store as a quick fix until you get the longer term one .
I also think dropping the frat is the way to go. I realize it may feel like a failure or loss, but it doesn’t seem to be doing you any good at this point.
Now is the time for you to create your own structure. You might try approaching college like a job. You do get to schedule your own time to a great degree but you have to be sure to follow through on each assignment.
This can be a tough transition. Try to take care of yourself.