Excessive bowel gas in abdomen. Help.

I'm feeling this from last three to four months or so during night specially. I get up feeling pain or tightness, tender in lower abdomen like I have urge to pee but it is generally the gas that is causing the bloating and giving sense of urination. However the quantity of urine is not very much. Then after some of the gas gets released and I start feeling normal again, but gases keep on coming and bloating and burping continuous. This is happening in early morning hours.  Please help, is it because of gas simply or is it related to urinary system as well. It is not happen in the morning. Tests  done - Urine routine,USG abdomen + pelvis, reports are Normal only came is USG excessive bowel gases in abdomen. Medicine, given syrup Gasovia, Tab Urimax, Tab Etos 60, cap Rabemac DSR for 5 days. But it doesn't cured it completely... Symptoms are back. Please help.