Metastatic???

I havent written anything in a while on here. I was diagnosed with Breast Cancer last April and completed my 16th chemo treatment on Oct 15th. I had a hysterectomy on Mar17th, prior to that on Mar3rd I had a chest x-ray, it showed changes from the one that I had last May. Yesterday I saw my Oncologist for my check up. She looked at the x-ray and came back in the room to tell me it doesnt look good. She said I have fluid in my lungs and a few specks. So I'm scared to death. I get a pet scan on the 6th so I just feel so broken hearted right now. I have 3children, 9,7 and 3. All I can think about is I may not be here with them in a few years or so. I know I don't know all the details and the facts, I also know I should have hope. But all I can think of is them and how much I want to be here with them. Please keep me in your prayers.