Help Getting re-motivated!

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Hello all!
So let me just start by saying I was extremely successful using MyFitnessPal in the past... I busted my butt last year from April till August and lost 37lbs just in time for a trip with my husband! I was so proud of myself! I was only 7lbs away from my goal. Then for some reason, after we came back from our trip (we were gone for a week), I completly fell off just that quick! :-( I stopped consistently going to the gym and my crappy eating on my trip carried back over at home. Needless to say I've gain back 13lbs of my weight over the course of the past few months. I really want to start eating healthy again and working back out and would like to loose 20lbs by August and keep it all off this time , but I don't know why I cannot find the motivation. I just can't. I have started trying to eat healthy again but pushing myself to get to the gym seems so darn hard (even though I've done it before). Please, any motivation is much appreciated!!! Xoxo