Middle back pain after eating

Patient: Every time I eat any meal .. I feel annoying pain in the middle of my back..and after cracking it.. pain goes away.I was advised that this could be related to stomach.. but I believe that it is something in my back.. because pain totally vanishes after cracking my back againt a hard edge.. (I lean backward against the edge till it cracks.. or sometimes get it pushed by my wife)this is becoming so annoying and is affecting my life .. I normally apologize and avoid any business dinner or any invitation for food.. because I know I will suffer if I could not get my back cracked after eating.any ideas?thank you so much in advance