you may feel the wind movement in bowel some times ,that may be the only explanation if you are not pregnant .
Stool analysis done 2 yrs back has no importance now .If you are concerned get a fresh examination of stool ,better will be to get it on 3 consecutive days .
From the symptom of urgency it is likely you are having some infection that usually present with griping pain ,frequent loose motion
presence of w b c in stool 2yrs back might have been due to infection
please get a check up with physician and take treatment .
DO REGULAR WORK OUT AND TAKE BALANCED HEALTHY DIET TO REDUCE WEIGHT .
Till you get check up you may take a course of brakke 1 tab 2 times after meals for 5 days for intestinal infection .
hope you get all right soon