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Janet, my prayers are with you all.

Something for you to consider...

IF mom would refuse surgery if that's what the tests indicate, is there anything to be gained by putting her through the test? Could she possibly be given the anbtibiotics to see if they work first? (since that would avoid any sedation or invasive procedures) In her shoes I think I'd push for that before I'd agree to any more tests.

My grandma had several episodes of unexplained rectal hemmoraging over many years. The dr kept insisting she have colonoscopies to try to figure it out and nothing ever showed up. Finally the dr told her it was time for the dreaded test again...
Grandma looked him in the eye and asked "IF you find something will you want to operate?"
He took her hand and said kindly "Clara, with your heart as it is, I'm not sure surgery is a good option for you."
Grandma thought about it for a minute, put her other hand on top of his, locked eyes with him, and said "Then you shove that camera up your own @$$ 'cause you're not touching mine!"

Dr Adams still has to tell me that story almost every time I go to see him. He said he loved her spunk and in the long view, she was right. Sometimes we need to say ENOUGH already and do what we can without trying to figure out things we can't change anyway. Is your Mom maybe reaching that point?

I don't want to upset you, but the situation just reminds me so much of what grandma went through. She, by the way, lived several more years and never did have that test again. In the end she died of heart failure.