Losing, Making, and Maintaining a "Good" Competition Weight!

I cant put into words how hard it is for me to "try" to lose weight. I walk around anywhere from 191-195lbs at any given time. Ive competed most recently in the 180-189lb divisions at local tournaments but feel that I would be most competitive in the 170-179lb division. I work overnights, have 3 kids, and a stomach condition (I.B.S). It is soooo hard for me but I really want to be in the "right" weight division. Just venting but would appreciate any real insight into how I can get my weight down to 185lb walk around and 179lb competition weight. At least fat kids are hard to kidnap! ;)