What is your problem if you have to go to the bath room but when you sit down its only gas?

It may be nothing out of the ordinary. ANY pressure on your internals will trigger the response you felt. Women who are pregnant, for example, ALWAYS have the urge to go to the bathroom because of the growing fetus pressing on the bladder from the inside as the uterus expands with the growing baby. SO, it may very well be completely a natural thing, the gas causing internal pressure on your internal organs trigering the response to relieve yourself...