Oral Lichen Planus Can Lead To Cancer? Cheek Sores With White Lines

I think I have Oral Lichen Planus but I can't get a doctor to confirm it.  I have had mouth sores in my cheek area since 2009 and now my gums are very red and inflamed and have been told that I have white lines on my inside cheek area.  When I go to a dentist to have my teeth cleaned, I am always turned away because they don't like the looks of my mouth sores.  In 2013 I had doctor swab my mouth and send for testing and also did blood work but was told nothing showed up. I think she was looking for bacterial infection.  In the mean time, I continue with a very sore mouth.

I have a hard time eating anything because the sores are next to my bottom back teeth so eating irritates the sores a lot at night I sometimes bite the area with sores due to swelling so they pretty much never heal. 

I recently went to a new dentist and she too wouldn't work on my teeth but she gave me details as to her concerns and told me to get checked for an Auto Immune disorder.  I have since been to a doctor and had blood taken to check for that and then they sent me to  ENT.  He mentioned Oral Lichen Planus which was the first time I have heard of it.  He wants to do a biopsy and then he mentioned a steroid rinse. 

I also researched OLP and I have all the symptoms listed so I just don't understand how going to doctors since 2010 about the mouth sores, no one can figure it out?  Am I finally heading in the right directions for diagnosis?  I scares me that it has been left un treated for 5 years when I read that sometimes those with OPL can lead to mouth cancer.