Oh, Roberta, I'm so sorry you still have so much uncertainty, on top of everything else. It's one thing when doctors tell you, "You have X and this is what we'll do to treat it," and quite another when you're left hanging in limbo about it, where you know what you have ain't good, but they're not sure how to treat it yet.
Your friend Sue means well, but she knows you won't stop thinking about it. Trying not to obsess about it seems more reasonable, but uncertainty does make that very difficult, and panic more likely.
If any of us can help you, in any way, please let us know. We're all here for you.
Enjoy your time with Heaven today. One of the wonderful things about dogs is that they are fully present in the moment and, experience that, and are able to enjoy that, without worrying ahead, and I wish we could all do that.