Wanda,
There is no magic wand to wave to allay your fears...it is the elephant that always sits in the room. I'm not sure, when these things crop up, that there is anything to do other than what you are doing and that is to find comfort in those that have walked this path. Hopefully, the scans will bring good news and you can send that elephant to a corner somewhere.
Just think cruise

and that beautiful calm water in the Carib to help you breathe better when the fear starts to rise.
BTW..the Oasis was wonderful...too much to do in a week. Embarkation was a snap...debark...not so much.
Hugs, Deb