Help define this Nerve

[inpain]

Hello, first time here.
First off I want to say that i have disc degenerative disease, yada,,,yada,yada, at any rate i have 2 lower discs on the way out. very very thin.
This has been on-going thereapy since the Early 80's...
I have visited a few very good massage therapists, my preference is Swedish as this has proved to be the most benificial.

My main focus is the nerve that runs down the center of the spine, i think it's called the iliohypogastric nerve, or the subcostal nerve..!
At any rate when this nerve is Manipulated My pain is immediately gone, blood circulation is increased and I feel alive once again.
Why do I feel so good when this nerve is Massaged..? And only a few Therapists have found it..? This just so happens to be my Trigger point..!
Immediate release from any pain, anywhere in the body not just lower back....!
Somehow i think this nerve is been trapped.
Could someone help me define this nerve, and can I somehow trigger this nerve myself..?