Wow, that was really something from that doctor.
The studies are very necessary, it's one of the few studies indicated by a dentist. It is also necessary to test for clotting, and indicate that you avoid taking any medications such as ibuprofen, diclofenac and those that do not clot well, to prevent bleeding.

That's not my area, but I do know about surgical procedures and there was essentially a big failure.
I hope everything goes better next time, although the fear will always be there.