Spinal subluxations can cause all kinds of health problems, which have no connection to back aches. I would suggest getting your spince checked out by a good chiro.
I read that kidney problems, liver / GB problems could also be caused by mislaigned spine. Even High BP.
Sometimes the results can be miraculous.
Something else to try out is good yoga practice. I think yoga helps in elimination. If eimination is good, bloating cannot happen.