How very discouraging!! I can imagine how frustrated you must feel right now.
While many people feel that measuring works well for them, one of the problems with measurements is that if you squeeze you can knock off an inch and get an inaccurate measurement, also if you don't measure in the EXACT same spot (particularly an issue with hips) you won't get an accurate measurement. I've had it happen that I lose pounds and see an extra inch but at the same time my clothing size is shrinking. So, you may not be measuring right, particularly if you haven't gained anything. Also keep in mind a bloated day will throw your measurements off as well. I wouldn't worry too much about it. Instead look at other indicators of success: how are your clothes fitting these days? How is your health? How is your fitness level? You may have just hit an early plateau. Are you logging your calories accurately? Review your food diary for any inaccuracies or for any splurges.
That being said, if you are doing it all and are not losing you may want to discuss your situation with your doctor or enlist the help of a dietitian.
5lbs may not seem like much of a loss but it's a loss, so you are on the right track. Don't let the numbers get you too discouraged and do seek out professional help if you feel like you need it!
Good luck! Don't give up! Every pound counts!
I'm so sad
. I know that is still upsetting since it's a gain instead of a loss, but at least it's only 2. That could really be explained away just by not having the measuring tape in the same place both times, too. Hang in there. You've got a lot to work against in your diet, so 5 pounds is very good and something to be proud of.
You've lost 18 months if I've subtracted correctly and that is a lot to be proud of! 
