Since you seem to be on a plateau for more than 3 weeks, look back at your trackers and see what trends show up.
MOST OF ALL, set yourself NEW goals that are not based on the scale.
Have you been sticking to your calorie count? How do you rate on the hunger scale before and after eating? Are you getting the nutrients you need? Are you drinking your WATER?
Is hula hooping your ONLY activity? Mix it up! Take a walk, use the stairs at work instead of the elevator, get a jump rope, try resistance bands. Strength training is great at boosting your metabolism. Wear a pedometer - see how many steps a day you are averaging for a week, then try to increase it 10% until you are getting over 10,000 steps a day every day. Try the Couch to 5K training program.
(It's GREAT that you are hula hooping, but it may not be getting your heart rate over 65% of max and into the cardio range.) Remember the body adapts to routines.
And finally, are you getting enough sleep? Try the Official Better Sleep Challenge if you think this is an area for improvement.
Remember - it's consistency, not perfection, that adds up. Two steps forward even if there's one step back. You can do it!