Forget the biopsy. You don't need to suffer that much.
Ask to your doc why he wants to perform a biopsy. If he suspects something, it might me fine. But if he is doing it because he doesn't know what else to do then it's just crazy.
I would look more about yeast, parasites or bacteria. You are at the right place on this forum. Try to find an holistic/environmental MD ASAP.
Please learn what Marjorie Crandall has to say about biopsy performed for no valid reason by reading her candida packet. You always have the right to ask questions and to say no to proposed treatment.