I was scared to death with my first one, so I know what you are feeling. The good thing is meningiomas are slow growing and benign. They are not a death sentence! I had one 20 years ago, had radiation done and it was gone. Just discovered a second one a few months ago. I have a new doctor, he wants to wait and see with this one.
Best things to do are to consult with the doctor, keep getting scans, and discuss treatment. Join a support group, especially one that meets live. The one I joined last time, really saw me through a lot. Yes, this is frightening, but you wil get through this.