It will feel like its in the upper part of the hip if its the sacroiliac as the other poster mentioned.
But since you've had discomfort in the lower area I would want to have that addressed first.
It could very well be the culprit.
When you have a pinched nerve in the back, which is what you have basically when you have pain there, it shuts off the flow of nerve energy to some degree.
When the nerve energy gets cut off it will be very likely be getting cut off to an organ or some function of the body.
Chiropractors have charts which show which part of the back controls nerve function to the different parts of the body and I remember that digestion was low on the back.
My Mom had an interesting experience.
She was having some very bad experiences with her heart for a few days and knew that something was quite wrong.
Reluctantly she checked into a hospital and was there for a few days and endured massive amounts of tests.
Many thousands of dollars later which was billed her insurance co., the hospital determined that they could find nothing wrong with her.
Feeling better just to be out of that prison she later went to a chiropractor who had some testing equipment which gave her a print out of the areas of her back which had mis-alignments of her spine.
She got an adjustment and felt wonderful thereafter.
The printout showed the most nerve shutoff exactly where the nerve energy to the heart goes through the spine.
Needless to say she has very little faith in hospitals or mainstream medical anymore.