OBSESSED! HELP!

So I think I finally figured out what holds me back from making serious strides in my weight loss goals; I've been consistently losing and gaining the same 12 lbs since my daughter was born, and I think I may have figured out why.

Last night I tossed and turned for hours, even getting up and weighing myself in the middle of the night at 3 am just to see if I lost anything from the last day. I've been exercising good, eating under my cals, cutting out bad foods, low carbs, drinking all water and now this is all I can think about. I even woke up way early this morning (after a night of no sleep tossing and turning obsessing about what the scale is going to say in the morning) and laid in bed for AN HOUR AND A HALF just thinking about what the scale is going to say, freaking out over 4th of July barbecues and if I'm going to screw up today. I get on the scale at least 15 times a day to see if what I weighed yesterday at that time, will match up.

Part of me thinks this is a good thing because I'm so hard on myself I wont screw up and eat things I'm not supposed to and let up on exercising; the other part of me knows this is borderline crazy.

The last time I obsessed this much I burnt out, did a 180 and gained all the weight back. Any tips on how to relax and not stress so much?