Pain in the paralumbar area refers to low back pain—is that what you mean? This could be due to muscle injury and inflammation hence it is warm to touch. It could also be due to spondylitis of lumbar vertebra or a herniated disc. An abscess too cannot be ruled out nor can a pain originating due to kidney stones. Kidney stones have been ruled out in your case. It could also be due to referred pain from colon.
There are several causes for increased amount of gas in abdomen like gulping food rapidly, drinking aerated drinks, acidity, celiac disease, irritable bowel syndrome etc. Whether the flatulence is foul smelling or odorless should also be looked into.
However it is difficult to diagnose without examining. You will need to undergo a few tests like X-rays and stool test (to rule out entamoeba). I think you should see an orthopedic specialist and a gastroenterologist too.
Hope this helps. Please let me know if there is any thing else and do keep me posted.
Flatulence is a very commn problem. Common cause would be food intolerance.Sometimes people who lactose intolerance,get flatulent when thsy take milk or anything which contains milk. See if any particuar food induces flatulence.Do regular exercise.That helps very much. It is easy to diagnose amebiasis, a simple stool test can make the diagnosis. And amebiasis genrally cannot account for ur symptoms.