I went through a similar situation with my son at 5 months. I tried everything from differnt bottles, differnt formulas, breat milk, leaving the house. My husband tried to feed him, I even went and stayed with my mom for a week to see if she could help feed him. My ped. said he would not go hungry, but he would cry so hard for so long that he would make himself throw-up.
I gave up trying the wean and started introducing a sippy cup. I started with the little Advent sippys and took the inside stopper out. I usually did watered-down juice. By 11 months he was drinking from a sippy and I finally weaned him at 11 1/2 months.This allowed me to be able to leave the house, at least for a few hours, as my son stayed with my husband.
When he was finally weaned I took a trip to visit a girlfriend out of town. I justed needed a day or two away after feeling teathered to a baby.
We were able to get past the biting and as he grew he would stroke my face as he nursed. It was a wonderful experience, but I did miss the freedom of going out for a day and worring that he was hungry.
Good luck.