Post baby body

I gave birth 4 weeks ago and I'm totally depressed with my postpartum body. I've gone up 3 dress sizes. My OH tells me I look amazing and that I'm being hard on myself but every time I look in the mirror I am disgusted, I feel so very ugly and I don't even want to leave the house anymore. I see all these transformation photos on the internet of ladies springing right back to pre baby figure straight away...just how?! I have an event in a couple of days and must have tried on about one hundred dresses and they all look hideous. I really need a confidence boost, please tell me I'm not the only one who feels like this?