I'm sorry that they have been unable to find the exact cause of your abdominal pain
Organic basically means that there is underlying structural disease causing the medical problem, Non-organic means that no identifiable strucutral disease can be found or the problem is related to dysfunction of normal structures. Without knowing your diagnosis, pain treatments are at best, a guessing game
One can obtain an idea of the origin of the pain - whether from nerve, spinal, visceral, or soft tissue origin by a careful history, I do not have enough information to ascertain which. Certain medications are more effective for a type of pain, for instance Nerve medications like Neurontin for nerve pain, visceral blocks like celiac blocks for visceral pain (organ pain)
Without a diagnosis of a diseased organ its unclear how a celiac block is working inyour case - usually it is used for abdominal cancer related pain
Have you had automonic function tests to assess abdominal autonomic function ie gastric emptying studies? Has diabetes been ruled out (a common cause of abdominal nerve related pain). Have you been checked for Porphyria (a rare but treatable cause of functional abdominal pain, a simple urine and blood test can tell). Also a herpetic viral infection could cause a similar picture with residual nerve damage. Lyme disease can cause a thoracic radiculopathy but not one that lasts so long, although there could be residual nerve damage. A vasculitis (inflammation of blood vessels) can cause ischemia of the abdomainal organs and chronic pain, I dont know if you have had an abdominal angiogram?
Narcotic drugs are effective in many types of chronic pain and are 'broad-spectrum'. Tolerance does develop over time requiring higher doses to get the same effect. Drug holidays can help avoid this to a certain extent. I cannot predict how they will change in your case over the next few years. Better to find other medication without tolerance and addictive potenital, and more specific for your problem, for instance nerve pain related medications like Neurontin, amitryptaline, Venlafaxine etc, or devices such as a spinal stimulator. Please see you pain management doctor for details or alternatively the Pain Management Center at the Cleveland Clinic over a multimodal pain management service if you would like another opinion. They may also be able to assess for a spinal stimulator if you are suitable for this.
Good luck
(more on above) with and without contrast), MRI