Work with your primary care doctor to get a referral if need to an oncologist or hematologist to review current testing findings and set a path for needs to be done next. Labs can tell them many things. Some of these labs come back quick and others need more time.
Blood draws are the most common to get the information need for initial review. Also, a urinalysis with a 24 hour urine test will likely give some good insight.
After all of that, they may find a bone marrow biopsy is needed. It’s a pretty simple procedure although recovery is different for everyone. My hip was very soar several days later. But nothing I couldn’t manage.
We have all had our own path for determining where we are and where we might be headed. No two of us are the same but we do however have many of the same stories and experiences. Stay calm and find a good doctor that can support you through this. Talk to family and try not to self diagnose.