Hi Becky, your oncologist would be in the better position to diagnose your possible blood cancer. There might be a reason she’s leaning towards MM even though you feel you have a lymphatic disease. Bone pain, back pain, low blood RBC/WBC and platelets being some of the primary symptoms with MM and not lymphoma.

With all your research you’ve possibly been on this website that discusses the differences between MM and Lymphomas but I think you might find it interesting or worth a second look.
https://www.medicalnewstoday.com/articles/multiple-myeloma-vs-lymphoma#comparison-table
With your current symptoms, your doctor may have some merit in her leanings…
I’m relentless in my positivity and encouragement because I’ve been on the ‘holding on by one toenail’ point in my life a couple of times. It’s imperative to take charge and keep moving forward. So whatever beef you have with your doctor, set it aside for now and maybe give her the benefit of the doubt and get the bloodwork done.
If you want to play roulette, that’s fine but I think that’s cavalier considering you’re asking for help finding a diagnosis. It shows me you’re not quite ready to do that. ☺️
What do you think? Are you with me on this? Will you call your doctor please?