Z.B.
It's not going to do you any good to worry, is it? Is that going to help you in any way? You don't know what you're dealing with, so right now the best thing you can do is distract yourself. Waiting is hard, but that is where you are at.
Dr. Google is never a good idea. The only people who post anything are those with really bad cases. So you spend time researching something and only reading about the worst case scenarios.
Doctors tend to not want to tell their patients anything until there is something to tell them. A wise doctor ins't going to tell you the worst case scenario. A wise doctor is going to wait until all the tests are in and he/she feels very confident in telling you what's going on. Sounds like the doctor did her job!
I know it's not easy, but the best thing you can do is nothing. There is nothing to do. There is nothing to think about. There is nothing to research. After the doctor reads the MRI and you have a diagnosis, then you can ask the doctor questions. But stay away from google.