I have taken for the most part generics for years because of insurance and I can't say I have found them to be any different acting. My pharmacy has changed vendors of a med several times and it was no less effective so I have always chalked up the idea the generics aren't any good to psychosomatic type phenomenon.
This is an interesting article. I am not saying that the argument that a generic isnt effective couldn't be true in some cases but the data doesn't back up the assertion... At least in the quick Google Searches I performed.
http://www.forbes.com/2009/07/27/generic-drugs-prescriptions-lifestyle-health-drugs.html
Edit: Please note this is an "academic discussion" and C I don't think you are being a psychosomatic so please don't take my comments /questions that way. If your pain control isn't working then by all means push until you get what you need. Hang in there. You have been through too much.