What Causes Persistent Pain In The Fingers Post Being Scraped By A Lobster?

Hello... Just over3 months ago, I was in the Caribbean and scraped my hand on a fresh-caught lobster. It broke the skin but seemed to heal fine. About two weeks later, I notice throbbing in my middle finger, but the pain would sometimes migrate to all of my fingers. I have gone to several doctors... I have taken numerous antibiotics, been given hand creams, wrapped my hand at night, used combinations of ice and heat, and tried a carpal tunnel brace, but nothing is working. The pain is now constant and unbearable -- but no one can seem to help identify what is going on... Any suggestions????? Thanks, Monica