Still Recovering From Severe Auto Accident Almost 6 Years Ago

I was involved in a serious automobile accident almost 6 years ago now . I was T-Boned on the passenger side of my car . The driver admitted to going 55 M.P.H. no brake skid marks were ever seen later that day by police. I was removed from the car , and placed on a backboard , neck brace applied , and taken to the hospital . My right knee went into the dash , my head went to the left breaking the drivers side window , my head then hit the mirror , my seat belt holder went into my kidney , and the breaking a rib , and puncturing my lung . I had hurt myself before , but I never knew the real meaning of pain before until then , and now. My right knee was three time the normal size, I had a concussion , I was  urinating blood , and my neck ,and back were killing me. I had to have a total knee replacement , anterior cervical discectomy with hardware , and fusion at several levels , lumbar laminectomy with hardware and fusion at several levels.

My knee is doing o.k , my neck is doing o.k , but my lower lumbar area (right side ) , and my right leg pain is worse now that before my surgery . I have had 2 mri , emg . which showed severe nerve root irritation in paraspinal lumbo area ( what ever that means ) I just had a myelogram  ( ouch ) . My Neurosurgeon says everything looks fine , and my fusion is looking great , BUT why am I having worse pain now that before. The Neuro. said he cannot see any compressions anywhere , but feels that scar tissue is a key element ? I am now taking Gabapatien 300 mgm three times a day, and in 30 days will possibly up the dosage. He spoke with me about pain management ( I had several injections in my neck , and lumbar area , and unfortunately they did not work) . The doc. said that pain management can do more than just  injections )  I am in pain 24/7 , and just want it to STOP . Am I being unrealistic here in my request ? 

I am starting to be very depressed , and I am tired of being in pain , and am crying out for help to get me back on the right track in dealing with all of this .

I have a very high tolerance of my pain level , but that is wearing away .