Next Steps of The Journey!

I've been a bit teary-eyed this morning. Not out of sadness or fear, even, but out of the sweetness of the Lord. He's sent me you guys- people of incredible faith! People who bring Mike and me encouraging words straight from the Lord! This is pure, sweet honey to my soul and the tears flow from pure joy! So, I thank you!
Here's what we know: There is a golf-ball sized cyst in my left arm-pit (feels like I'm carrying a golf-ball around under my arm.) This is not the origination of the cancer, but only a tell-tale sign showing cancer is somewhere else in my body. The first thing we have to do its identify the origin, so we'll know what kind of cancer we're dealing with and can make a plan of attack!
Anatomically, it's close to the breast, so that's the first "guess"... I go in for an MRI in the morning that will determine if this guess is correct, or not. (I just had my annual diagonostic mamogram Dec 29th, and got a clean bill of health, and had a hysterectomy with all clean blood work Dec 31st. The uterin biopsy was clean, too, and I have had absolutely no pain at all.) So far, this looks completely unrelated.
If the MRI is negative to breast cancer, I'll have a full-body CAT scan checking for cancer in major organs (stomach, liver, etc) and if that's negative, we'll check the bones.
So, that's the 3 levels of tests as I understand it. Mike and I do not intend to "cross any bridge" prematurely or play any guessing games. We'll take one test and result, cover it in prayer and proceed on faith that God is directing us.
That's what we know for now. Please continue praying to our Lord! We're leaning hard on all of you and on His merciful hand!