so have you seen the dr recently about your dia?
to be perfectly honest, if youve been eating ok for the past month, just eating peanut butter or saltines wont really do anything. when youre shitting watery crap all the time, theres a problem with gut motility and/or absorbtion. that is to say, your guts are either pushing the food through too fast or its not getting absorbed properly or a combination of both.
so yeah, go see a dr. if its a diet thing, then good. lifes easy, but if its something more serious then you can get it sorted out.