First post and disappointed

I recently got my very first lolita dress from Qutieland( the Dream of Lolita AP Melty Chocolate OP) and I'm so upset. The dress is amazing but I'm upset about my weight. I've gained a ton of weight and now I can't even fit in the dress I've been waiting for since February. T^T I don't know what I should do now, on one hand I could trade it on the comm sales, but on the other I can lose all that weight and wait another few months to try and fit in my dress. (Easter is in a couple of days too and i really wanted to wear it then.)