As far as I remember the bone marrow biopsy was more intimidating than painful, the whole procedure took a few minutes and the biopsy itself was less painful than the lidocaine injection. The injection was deeper and prolonged than other superficial anesthesia. The area remained sore for a few days, as if I was kicked in the ass…
I know many people who went through this biopsy and as far as I know none of them had any long term effects.

Good luck with the new hematologist and the biopsy!